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PubMed2004

Do sibling tits (Parus major, P. caeruleus) disperse over similar distances and in similar directions?

We studied dispersal movements by sibling pairs of great tits, Parus major, and blue tits, P. caeruleus, in a patchy environment, in order to test whether siblings are more similar in dispersal than expected by chance. Because of possible common environmental effects due to the heterogeneity and finiteness of the study area, we compared the similarity among siblings with the similarity between each sibling and an unrelated bird that fledged in the same patch and year, as close to the siblings' nest as possible. Siblings of both species were not more similar in dispersal distance than they were to control birds. However, great tit siblings dispersed in similar directions compared to control birds, and this result was not affected by the degree of matching between sibling and control birds. As a consequence, siblings ended up breeding at closer distances from one another than control birds. Heritability values calculated from parent-offspring regressions were close to zero, suggesting that there is no additive genetic variance for dispersal distance or dispersal direction. We propose that similarity in dispersal direction originates from association of siblings during dispersal or during activities that influence the choice of direction, such as postfledging family movements. Our results show that non-independence in the choice of dispersal direction by siblings may influence small-scale kin structure in this population with high local recruitment.

Animals↗

PubMed2006

Similarities in siblings' experiences of neglectful parenting behaviors.

OBJECTIVE: Researchers and policymakers typically assume that within families, individual children are at an equivalent risk of neglectful behaviors. There is evidence that siblings experience differential parental treatment, and some research suggests that parents may maltreat their children to differing degrees. However, because neglect is typically a family-level construct, there may be a high correlation between siblings for this type of parental behavior. Therefore, our objectives were to investigate the extent to which siblings reported similar parental neglectful behaviors, whether sibling correlations for family-level types of neglectful behaviors were greater than those for child-specific forms of neglectful behaviors, whether high-risk groups differed from lower-risk groups in similarity for sibling reports for neglectful behaviors, and factors predicting differences in sibling reports of parental neglectful behaviors. METHOD: We assessed parental neglectful behaviors using child reports for 59 sibling pairs, representing both clinical and community samples. All children completed the Multidimensional Neglectful Behaviors Scale, which measures both child-specific and family-level neglectful parenting behaviors. RESULTS: Sibling intraclass correlations for neglectful behaviors were high and significant, and there were no differences in sibling correlations between clinical and community samples. Furthermore, there were no differences in correlations for family-level and child-specific items. Opposite sex siblings reported greater differences in parental neglectful behaviors, with boys reporting more neglectful behaviors than girls. CONCLUSIONS: Siblings report similar neglectful parenting behaviors, regardless of whether the family is high-risk or not, and whether neglectful behaviors are measured as a family-level or child-specific phenomenon.

Adolescent↗

PubMed2006

Mortality in siblings of patients coinfected with HIV and hepatitis C virus.

BACKGROUND: Coinfection with hepatitis C virus (HCV) is a poor prognostic factor for human immunodeficiency virus (HIV)-infected patients. We examined whether the increased mortality in these patients is partly explained by a familial excess risk of death. METHODS: Danish HIV-infected patients who had had at least 1 HCV test were included (n=3531). In addition, 336,652 population control subjects matched for sex, age, and residency were identified from the Danish Civil Registration System. For both HIV-infected patients and population control subjects, we identified all siblings born after 1951, with dates of death or emigration. Siblings of HIV-infected patients were classified according to the patients' HCV serostatus. Survival after age 20 years was compared among the groups of siblings. RESULTS: We identified 437 siblings of HIV/HCV-coinfected patients, 1856 siblings of HIV-monoinfected patients, and 285,509 siblings of population control subjects. Mortality was substantially higher in siblings of HIV/HCV-coinfected patients than in either siblings of HIV-monoinfected patients (mortality rate ratio [MRR], 2.97 [95% confidence interval {CI}, 1.98-4.45]) or siblings of control subjects (MRR, 4.23 [95% CI, 3.09-5.79]). Siblings of HIV-monoinfected patients had slightly higher mortality (MRR, 1.43 [95% CI, 1.10-1.85]) than siblings of control subjects. CONCLUSIONS: HCV infection is a marker of familial factors that affect the survival of HIV-infected patients independently of the pathogenicity of HCV.

Adult↗

PubMed2005

One month after diagnosis: quality of life, coping and previous functioning in siblings of children with cancer.

BACKGROUND: The aim of the present study is to describe the quality of life (QoL) of siblings of children with cancer and to predict it according to their health before the diagnosis of cancer in the ill child and their ways of coping with the illness. METHODS: Participants were 83 siblings from 56 families-46 girls and 37 boys, aged 7-18. The assessment took place 1 month to 8 weeks after the diagnosis of cancer in the ill child. The siblings' QoL was assessed with the TNO-AZL children's quality of life questionnaire (TACQOL). Coping strategies were assessed with the Cognitive Coping Strategies Scale for siblings (CCSS-s). Physical problems and eating and sleeping problems that existed before the ill child was diagnosed were determined in a structured interview with the parents. RESULTS: A substantial number of siblings reported impaired cognitive and emotional QoL compared to the reference group. School-aged siblings (7-11 years) reported more trouble with motor functioning than peers. The coping strategy 'predictive control' (maintaining positive expectations regarding the illness) positively predicted siblings' QoL. The presence of health problems before diagnosis was negatively associated with siblings' QoL. Older siblings reported more negative emotions, while girls reported lower social QoL and reliance on 'interpretative control' (trying to understand the illness) was associated with fewer positive emotions. CONCLUSIONS: During the first 2 months after the diagnosis of cancer in a brother or sister, siblings have relatively lower QoL than peers. Health problems that existed before diagnosis may be a predictor of later adjustment problems. Positive expectations about the course of the illness appear to protect siblings from distress. Information about the illness is a delicate issue that requires parental guidance.

Adaptation, Psychological↗

PubMed2001

[Siblings with pediatric hearing loss. Data on age at diagnosis and degree of hearing loss].

The Deutsches Zentralregister für kindliche Hörstörungen (DZH = German Registry for Hearing Loss in Children) has so far (30.6.2000) entered data records of 4,027 permanently hearing impaired children. These records include data on a total of 151 pairs of siblings. In seven cases a third sibling was registered. An analysis of the data of siblings with different dates of birth shows that the diagnosis for older siblings was delayed 2 years on average compared to the younger siblings (mean 23.6 months, 95% confidence interval 19.3-27.8 months). The degree of hearing loss, which crucially determines the average age at which a child is diagnosed, correlates statistically significantly with pairs of siblings, so that misleading results can be almost totally avoided. In 11 of 17 cases of twins and triplets, the diagnosis was pronounced simultaneously for both siblings; in the remaining 6 cases, one sibling was diagnosed later. It has become apparent that younger siblings of hearing-impaired children profit from the concomitant routine diagnostic investigation of siblings of hearing-impaired children nowadays common in many institutions, but avoidable delays nevertheless still occur, as shown by the data for twins and triplets. Since in approximately 18% of the registered children with one or more siblings one of the brothers or sisters is likewise hearing-impaired, consistent family investigation is recommended.

Age Factors↗

PubMed1998

Urinary tract infection and renal damage in sibling vesicoureteral reflux.

PURPOSE: Siblings of index patients with vesicoureteral reflux are known to have an increased incidence of reflux. Previously reported studies have evaluated vesicoureteral reflux in asymptomatic siblings of children who were previously proved to have reflux. We determine the incidence and nature of vesicoureteral reflux in symptomatic siblings of children with documented vesicoureteral reflux. MATERIALS AND METHODS: Between January 1990 and December 1996, 624 patients were diagnosed with vesicoureteral reflux during the investigation of documented urinary tract infections. All patients were evaluated for reflux by contrast voiding cystourethrography and reflux was graded according to the international reflux study. 99mTechnetium dimercapto-succinic acid nuclear renal scans were performed to detect renal scarring. The medical records and voiding cystourethrograms of the 624 consecutive patients with vesicoureteral reflux were retrospectively reviewed to identify siblings with vesicoureteral reflux. RESULTS: Vesicoureteral reflux was noted in 85 siblings (134 refluxing ureters) of the 624 index patients (13.6%), including 1 and 2 siblings of 38 and 3 patients, respectively. Mean age at presentation of the 37 boys and 48 girls was 2.5 years. Reflux was unilateral in 36 siblings and bilateral in 49. Reflux was grades I to V in 8, 9, 51, 55 and 11 ureters, respectively. Nuclear scan revealed reflux nephropathy in 22 of the 77 tested siblings (28.5%). CONCLUSIONS: When vesicoureteral reflux is discovered in symptomatic siblings, it is usually high grade and associated with a higher incidence of reflux nephropathy. Of further interest are the findings that refluxing symptomatic siblings of index patients are usually younger and boys are as commonly affected as girls. Screening for vesicoureteral reflux in asymptomatic siblings is recommended to decrease the incidence of reflux nephropathy.

Child↗

PubMedDate not supplied

The similarity of siblings' attachments to their mother.

Do siblings develop similar attachment relationships with their mother? Attachment theory suggests that brothers and sisters growing up in the same family are likely to relate in similar ways to their parents, at least when parental attachment representations and interactive styles remain stable across time. In the current study, sibling attachment data from three research groups (from Pennsylvania State University, Leiden University, and the University of Western Ontario) have been pooled to assemble a sufficiently large sample of observations (N = 138 sibling pairs) for a detailed comparison of sibling attachment relationships. Spacing between the births, differences in maternal sensitivity, and gender of siblings were examined as possible sources of concordance of nonconcordance. Attachment security (including disorganized attachment) of each sibling was assessed with the Strange Situation procedure between 12 and 14 months after birth. Maternal sensitivity was observed with the same rating scale in a laboratory play session in one of the studies and in home observations in the others. Sibling relationships were found to be significantly concordant when classified as secure/nonsecure (62% concordance, p < .01, 1-tailed, intraclass correlation = .23) but not when further subcategorized. Maternal insensitivity to both siblings (shared environment) was associated with concordance of sibling nonsecurity. Siblings of the same gender were more likely to form concordant relationships with their mother (68%; p < .01, 1-tailed, intraclass correlation = .37) than those of opposite gender. Same-sex sibling concordance was comparable to the concordance found for monozygotic twins in earlier studies. Genetic factors may, therefore, play a relatively small role in the development of attachment.

Adult↗

PubMed2004

Disease severity in siblings with cystic fibrosis.

Since cross-infection occurs between cystic fibrosis (CF) siblings, we hypothesized that subsequent siblings may acquire respiratory pathogens at an earlier age and have a more severe course of pulmonary disease. We studied a retrospective cohort of 31 sibling pairs from the CF database at the Hospital for Sick Children. Kaplan-Meier curves and modified log-rank tests were used to test sibling differences in age of acquisition of Pseudomonas aeruginosa (PA), Staphylococcus aureus (SA), or any positive culture. Differences in disease severity outcomes were explored. Older siblings were more likely to have both SA and any CF pathogen first isolated from respiratory culture at an older age than younger siblings (P = 0.0050 and P = 0.0008, respectively, by modified log-rank tests). However, more of the older siblings were positive on first culture at time of diagnosis, introducing an age-of-diagnosis bias. Hospitalization rates, courses of oral antibiotics, FEV(1) % predicted, and weight and height measurements were not better in the older children. No differences in clinical parameters were found between older and younger siblings. The apparent finding of younger age at first isolation of pathogens from respiratory cultures in younger siblings is likely because many older siblings were already infected with these organisms at time of diagnosis.

Age of Onset↗

PubMed2003

Nine-year prospective association between older siblings' smoking and children's daily smoking.

PURPOSE: To explore the hypothesis that older siblings' smoking, after controlling for parents' smoking, influences children's smoking. METHODS: Study participants were 2981 students in the control cohort of a school-based smoking prevention randomized trial for whom parents' smoking and older siblings' smoking data were collected at 3rd grade and daily smoking data was assessed 9 years later through a self-report questionnaire at the 12th grade. Data were analyzed using conditional logistic regression and likelihood ratio tests. RESULTS: For families in which no parent smoked, the 12th grade prevalence of daily smoking was 31% when at least one older sibling smoked compared to 18% when no older sibling smoked. For families in which at least one parent smoked, the 12th grade prevalence of daily smoking was 41% when at least one older sibling smoked compared to 29% when no older sibling smoked. There was a substantial increase in the odds (OR = 1.60, p =.004) of children's daily smoking at 12th grade when their older siblings smoked, even after adjusting for parents' smoking. CONCLUSIONS: Older siblings' smoking is associated with increased risk of children's smoking after adjusting for parents smoking. Furthermore, there was no evidence to suggest that the influence of older siblings' smoking was different in families where no parent smoked compared to those where at least one parent smoked. Also, there was no evidence that the influence of older siblings' smoking was different in boys vs. girls.

Adolescent↗

PubMed2003

Sibling relationships when a child has autism: marital stress and support coping.

Family systems theory was employed to study sibling relationships in 50 families with a child with autism. Typically developing siblings expressed satisfaction with their sibling relationships. Parents were somewhat less positive about the sibling relationship than were the siblings themselves. As hypothesized, stress in the marital relationship was associated with compromised sibling relationships. Informal social support buffered the deleterious effects of marital stress on positive, but not negative, aspects of the sibling relationship. Contrary to predictions, families experiencing high marital stress who sought greater support from formal resources external to the family had typically developing siblings who reported a higher level of negative sibling behaviors than families who sought low levels of formal support. Findings reinforce the importance of considering family context as a contributor to the quality of the sibling relationship.

Adaptation, Psychological↗

PubMed1997

Health risk behaviors of adolescent and young adult siblings.

The present study tested the effects of older siblings' outcome expectancies, health risk behaviors, and consequences on the behavior and health-related expectancies of their younger adolescent siblings. Data were analyzed for 140 matched pairs of younger (n = 147) and older (n = 195) siblings. Younger siblings' alcohol use and expectancies were significantly associated with perceptions of their older siblings' drinking. Younger siblings' positive expectancies for other health risk behaviors (e.g., sex without a condom) were associated with their perceptions about the positive consequences their older sibling had experienced and with their older siblings' positive expectancies. These results suggest that vicarious learning from an older sibling is one mechanism through which adolescents form expectancies about health risk behaviors. Prevention strategies are discussed that focus on expectancies and older sibling influence on adolescent risk involvement.

Adolescent↗

PubMed2007

Looking after well siblings of adolescent girls with anorexia: an important parental role.

BACKGROUND: Research has suggested that well siblings of children with chronic and life-threatening illnesses are at risk for negative outcomes and that parents' responses to the illnesses can influence the adaptation of well siblings. Yet, parents' efforts to look after well siblings in the context of illness are rarely considered in literature about sibling adaptation. The importance of attending to the needs of well siblings was a major theme to emerge from a qualitative analysis of the experiences of parents of adolescent girls with anorexia nervosa. METHODS: In-depth interviews were conducted with 24 parents of adolescent girls with anorexia and analysed using grounded theory method. RESULTS: The data indicated that parents viewed caring for well siblings in the context of anorexia as an important role and responsibility. Parents reported making conscious and active efforts to look after well siblings by: maintaining normality; compensating for changes to routines; protecting siblings; providing emotional support; and managing the consequences. CONCLUSIONS: This paper provides a picture of the actions parents take to help well siblings adapt to anorexia in the family. Further research is needed to develop and expand this understanding to families experiencing a wide range of chronic and life-threatening illnesses. The findings underline the importance of clinical attention and further research into the critical parental role of caring for well siblings.

Adaptation, Psychological↗

PubMed1991

Psychosocial effects on siblings of children with autism and mental retardation: a population-based study.

The probands of this study were 60 children and young adults between 5 and 20 years of age, 20 of whom had siblings with autism, 20 of whom had siblings with mental retardation, and 20 of whom had siblings who were free of handicap. The three proband groups were matched for gender, birth order and socioeconomic status. The children were questioned about their sibling relationships and about particular problems they faced concerning their handicapped brothers or sisters and about problems concerning themselves. Parents were interviewed about the healthy child's behaviour and social adjustment. Mothers completed the Eysenck Personality Inventory concerning themselves. Siblings of handicapped children and especially siblings of children with autism were more concerned about the future. They also felt lonely more often and many of them had peer problems. They often regarded their handicapped siblings as a burden. They tended to have only one sibling. Siblings often did not know why their handicapped brother or sister was different from other children. There were more behaviour disturbances in the siblings of handicapped children and mothers with a child with autism reported more 'stressful events'. There were no differences as regards the personality of the mothers and the self-concept of the children between the three groups.

Adaptation, Psychological↗

PubMedDate not supplied

Outcomes of a nursing intervention for siblings of chronically ill children: a pilot study.

PURPOSE: To evaluate the outcomes of a structured, educational, and support group intervention (ISEE, Intervention for Siblings: Experience Enhancement) for siblings of children with chronic illness (cancer, cystic fibrosis, diabetes, and spina bifida), including a session with parents about sibling needs; and to describe sibling and parent perceptions of sibling experiences at home. DESIGN: One-group, pretest-posttest pilot study. PARTICIPANTS: A convenience sample of 22 siblings and parents. SETTING: A Midwestern university medical center. MAIN OUTCOME MEASURES: Knowledge of Illness Test, parent ratings on a global, single item, 10-point scale. RESULTS: Sibling test scores increased significantly after intervention, compared to baseline. Parents' average evaluation rating was 9 on a 10-point scale. Parents supported their positive ratings with verbatim descriptions. Sibling and parent perceptions of sibling experiences were congruent, suggesting the sources of potential adjustment problems in siblings, and were consistent with the literature. CONCLUSIONS: A randomized, clinical trial with a larger sample size is needed to evaluate the intervention further.

Adolescent↗

PubMed2005

Inhibition of motor responses in siblings concordant and discordant for attention deficit hyperactivity disorder.

OBJECTIVE: The authors sought to determine whether nonaffected siblings of ADHD probands have a motor response inhibition deficit and to assess concordance for this inhibition deficit in ADHD-concordant and ADHD-discordant sibling pairs. METHOD: ADHD-concordant pairs (21 probands and their affected siblings), ADHD-discordant pairs (18 probands and their nonaffected siblings), and a group of unrelated, demographically balanced, healthy individuals (N=24) were compared on measures of response inhibition, ADHD behavior, impairment, and environmental risk. RESULTS: Concordant-pair probands, their affected siblings, and discordant-pair probands exhibited inhibitory control impairment relative to healthy comparison subjects. The performance of nonaffected siblings was intermediate between that of ADHD children and the healthy comparison subjects. Group differences persisted after age was controlled, and performance was not correlated with the number of ADHD symptoms. In ADHD-concordant sibling pairs, there was a significant relationship between proband and sibling inhibition deficit. In ADHD-discordant sibling pairs, inhibition deficit was evident in half of the nonaffected siblings of probands with an inhibition deficit. Groups did not differ in exposure to environmental risks. CONCLUSIONS: Impaired inhibitory control aggregates in the family members of individuals with ADHD and may serve as an indicator of genetic vulnerability to the disorder.

Attention Deficit Disorder with Hyperactivity↗

PubMed1999

Siblings of adults with mental illness or mental retardation: current involvement and expectation of future caregiving.

OBJECTIVE: The study examined the factors associated with the involvement of siblings in the life of a brother or sister who has mental illness or mental retardation. Involvement was defined as the current provision of instrumental and emotional support as well as the expectation of future caregiving responsibility. METHODS: A mailed questionnaire was used to collect data from 61 siblings of adults with serious mental illness and 119 siblings of adults with mental retardation. The sample was drawn from two ongoing longitudinal studies. RESULTS: The two groups of siblings showed striking differences in their expectations about their responsibility for future caregiving. Almost 60 percent of the siblings of adults with mental retardation expected to assume primary caregiving responsibility in the future, but only one-third of the siblings of adults with mental illness held this expectation. For both groups, competing family responsibilities limited the involvement of siblings, whereas closeness to the family of origin led to greater sibling involvement. CONCLUSIONS: The extent of current and future involvement by siblings of adults with disabilities is a function of the demands and constraints of midlife as well as the degree of closeness with the family of origin. The findings highlight the importance of clinicians' work to support and strengthen family relationships, which loom large in determining the extent to which siblings are involved in the care of a brother or sister with disabilities.

Adult↗

PubMed2024

End of Life Events and Causes of Death in Danish Long-Lived Siblings: Reduced Dementia Risk Compared to Sporadic Long-Livers.

BACKGROUND: Better physical robustness and resilience of long-lived siblings compared to sporadic long-livers has been demonstrated in several studies. However, it is unknown whether long-lived siblings also end their lives better. OBJECTIVE: To investigate end-of-life (EoL) events (dementia diagnosis, medication, hospitalizations in the last 5 years of life), causes of death, and location of death in long-lived siblings compared to matched sporadic long-livers from the Danish population. METHODS: Long-lived siblings were identified through three nationwide Danish studies in which the inclusion criteria varied, but 99.5% of the families had at least two siblings surviving to age 90 + . Those who died between 2006 and 2018 were included, and randomly matched with sex, year-of-birth and age-at-death controls (i.e., sporadic long-lived controls) from the Danish population. RESULTS: A total of 5,262 long-lived individuals were included (1,754 long-lived siblings, 3,508 controls; 63% women; median age at death 96.1). Long-lived siblings had a significantly lower risk of being diagnosed with dementia in the last years of life (p = 0.027). There was no significant difference regarding the number of prescribed drugs, hospital stays, days in hospital, and location of death. Compared to controls, long-lived siblings presented a lower risk of dying from dementia (p = 0.020) and ill-defined conditions (p = 0.030). CONCLUSIONS: In many aspects long-lived siblings end their lives similar to sporadic long-livers, with the important exception of lower dementia risk during the last 5 years of life. These results suggest that long-lived siblings are excellent candidates for identifying environmental and genetic protective factors of dementia.

Humans↗

PubMed2001

Conditions of sibling support in adolescence.

This study examined the nature and extent of adolescent siblings' supportive roles and the conditions under which siblings provide support to one another about familial and nonfamilial issues. Data were collected from 185 adolescent firstborn (M age = 16 years) and second born (M age = 13 years) sibling pairs. In home interviews, siblings reported on family experiences and psychosocial functioning during the past year. In a series of 7 evening telephone interviews, siblings reported on their shared daily activities. Findings suggested that both older and younger siblings view older siblings as sources of support about nonfamilial issues such as social and scholastic activities and that siblings assume equally supportive roles about familial issues. Further, the results suggested that family background characteristics, sibling relationship qualities, and adolescents' psychosocial functioning were linked to the nature and extent of sibling support.

Adolescent↗