Considerations of elder sibling closeness in predicting younger sibling substance use: social learning versus social bonding explanations

Adolescent siblings are often similar in a variety of adjustment outcomes, yet little is known about the processes that explain sibling influences during adolescence. Two alternative explanations were tested, attachment (based in social bonding theory) and anaclitic identification (based in social learning theory). Hypotheses were tested with a sample of 613 adolescent sibling pairs (206 nonadopted, 407 adopted; elder sibling mean age = 16.1 years, younger sibling mean age = 13.8 years) across three sibling contexts (gender composition, age difference, and genetic similarity). Attachment explanations were supported so that the greater the perceived sibling emotional and behavioral closeness, the lower the likelihood of substance use; however, there were considerable moderating effects of sibling gender composition. Anaclitic identification explanations were not supported; closeness and elder sibling substance use did not interact to predict younger sibling substance use. Overall, this research adds to a body of work demonstrating important sibling influences on adolescent substance use.     

Birth order, family structure and personality variables

The birth order and family structure variables assessed included first or only child, position in multi-child family, position in dyadic family, age of parents at birth of given child, whether reared by one or both parents, whether reared under permissive or authoritarian family atmosphere. The personality variables assessed included Sociability, Anxiety, Dominance, Superego, Phlegmatic Temperament, Involvement, Self-Regard and other scales measured by the Howarth Personality Questionnaire. One hundred seventy female and 142 male undergraduates were tested. Significant relationships found included: anxiety lower in firstborns; superego higher in firstborns; persistence higher in those not dominated by elder sibling; phlegmatic temperament higher in permissive families; involvement and phlegmatic temperament lower in single parent families; self-pride higher in the elder of a sibling pair; individual tolerance higher in children reared by both rather than single parent.     

Kindred spirits: Influences of siblings' perspectives on theory of mind

Two experiments were conducted to examine the development of a theory of mind in 265 children aged 3 to 5 years from families of varied size. Even after verbal mental age was controlled, those who had a sibling aged 12 months to 12 years outperformed only-children in both experiments. However, the presence of a very young infant, or of siblings who were teenagers or young adults, exerted no benefit. Also, in contrast to some previous studies, younger child siblings and twins were just as helpful as older child siblings. The presence of multiple child siblings of varied ages above and below that of the participant predicted advanced theory of mind development over and above the effects of own age and verbal ability, despite the fact that neither overall family size nor birth order were significant predictors. These findings were reconciled with those of previous sibling constellation research around a model of family social influences in which the opportunity to play, converse, and disagree in distinctively childish ways with brothers and sisters provides unique insights into the workings of the human mind.     

The Role of Contextual Threat in Predicting Self-Reported Distress among Siblings of Children with Cancer

Each year, 14,000 children are diagnosed with cancer in the United States. Prolonged, intensive treatment regimens disrupt the entire family system, but effects on siblings are poorly understood. In this preliminary investigation, we employed a risk and resistance framework to study adjustment among 30 siblings (aged 10–17) of children undergoing cancer treatment. We examined whether or not objective stress associated with the cancer experience (contextual threat) predicted sibling distress and explored demographic and disease-related predictors of sibling adjustment. Contextual threat was positively associated with sibling-reported distress, independent of sibling age, gender, birth order relative to the child with cancer, and cancer treatment intensity. From among the demographic and disease-related factors, only younger birth order relative to the child with cancer was independently associated with sibling distress. These results suggest that a subset of siblings may be at increased risk for elevated distress in the face of their brother’s or sister’s illness.     

Sisterhood-Brotherhood is Powerful: Sibling Sub-Systems and Family Therapy

Sibling interaction is an often overlooked aspect of family functioning. Individual development and many family behavior patterns may be attributed to autonomous activities within the sibling sub-system.
A number of phenomena in which siblings have profound influence upon one another are explored. Siblings collude and align with each other, at times help each other resist the powerful vertical influences of parents. Other sibling systems serve to enmesh the youngsters even more with parents. Important sib-behavior patterns include: the death or departure of siblings; the interplay between the sibling sub-system and the parenting system; and the roles that "well" siblings play vis-à-vis their "sick" siblings during family crises. The sibling relationship is seen as a life-long process, highly influential throughout the life cycle.
Understanding of sibling sub-system structure and dynamics can lead to more flexible therapeutic interventions. Direct work with siblings provides the therapist with more options and greater leverage in producing change for all siblings, as well as for other family members.     

Israeli kindergarten children's gender constancy for others' counter‐stereotypic toy play and appearance: the role of sibling gender and relative age

To test divergent theoretical predictions as to the impact of having a younger or older, same‐sex sibling or opposite‐sex sibling on other gender constancy, Israeli kindergarten children in two‐child families responded to a gender constancy task in which a male and female picture target engaged in counter‐stereotypic toy play and adopted counter‐stereotypic appearance. Children were also asked whether the target child could change sex at will and to explain the difference between boys and girls. Relative age of sibling, both independently and in interaction with participant sex, was associated with greater gender constancy in the face of counter‐stereotypic toy play. Relative age of sibling and sibling sex was independently associated with greater gender constancy in the face of counter‐stereotypic appearance. In both cases, children with a younger sibling evidenced greater gender constancy. Boys, especially ones with a male sibling, referred most explicitly to target's birth sex in accounting for his or her being unable to change sex at will. Genital and anatomical differences between boys and girls were cited more often by children who referred explicitly to target's birth sex and had a younger sibling. The results were discussed in the context of theories of gender development and the socialization of gender within the family. Copyright © 2008 John Wiley & Sons, Ltd.     

Family size and delinquency

A review of the literature shows that large family size is related to greater delinquency. The relationship remains when a number of variables, i.e., income, socioeconomic status, parental criminality, and family composition, have been controlled. The higher birth rate for lower classes does not appear to be an adequate explanation for this relationship, nor does less close parent-child affectional ties or less parental supervision although all of these may have some influence. The presence of an "infectious example" may partly account for the relationship, as does overcrowding. Large family size is typically associated with the constellation of undesirable family conditions involving poor role models (e.g., poor parental behaviour, parental criminality, sibling delinquency), poor child-rearing practices (e.g., inadequate parental supervision and discipline), and competition for physical (e.g., overcrowding, low income) and psychological (e.g., lack of attention, affection, family interaction) resources. An immediate solution is to reduce the size of families by helping prospective parents plan their families, and for those who wish it, making medical abortions more readily available. The long-range solution is through research to identify variables which significantly influence the relationship between family size and delinquency. Such studies must control for birth order, sibling spacing, siblings' sex, and sex of the delinquents in these families.     

Sibling Set Configuration and Family Dysfunction

The relationships between sex and birth order of the sibling set, number of parents in the primary family unit, and family dysfunction were assessed. The sample was restricted to two-child and three-child families, all of school age, and all living with one or both natural parents only, i.e., no one else was in the household. Chi-square analyses indicated that the likelihood of a family seeking treatment for one of their children was lowest with all girl sibling sets, intermediate with all boy sibling sets and with sibling sets in which all the girls were older than all the boys, and highest with sibling sets in which at least one boy was older than one girl. The patterns were stronger for two-parent than single-parent families. The results were interpreted in terms of two factors: (a) the relative commitment of boys and girls to supporting family norms, and (b) the relative stability of a family culture in same gender versus mixed gender sibling sets.     

Birth order and intelligence: an immunological interpretation.

The literature indicates that the IQs and school performance of children tend to decline with increasing order of birth. A hypothesis is here presented that the effect of birth order upon intellectual performance may result from an increasing probability of maternal immune attack upon the fetal brain in utero with order of parity. In support of this hypothesis, evidence is adduced from the literature that the fetal brain is antigenic, that fetal antigens may reach the immune system of the mother, that the incidence of maternal sensitization to fetal antigens increases with parity, that antibodies may readily cross the placenta and reach the fetal brain, that antibodies can be highly teratogenic, and that certain antibodies may damage, in a lasting way, the structure, function, and learning capacity of brains in experimental animals and human infants.     

The family dynamics of intellectual development.

Birth order effects on intellectual performance show both positive and negative results. The confluence model reconciles these conflicting data by proving that these effects interact with the age of participants at testing, such that young children should show negative or no effects, whereas older individuals (past age 11 +/- 2 years) should show positive effects. Birth order studies strongly support this prediction. Some writers have claimed the apparent relation between birth order and intelligence is an artifact created by applying a cross-sectional analysis to data that should have been analyzed by comparing siblings within families. However, if siblings within the same family are compared all at the same time, their ages are necessarily different. As a result, birth order effects are confounded with age effects. Moreover, within-family data conceal patterns of aggregate effects that cross-sectional data reveal.     

Predictors of Children's Emotional Distress in a Mother-Absent Situation: Implications for Caregiving Research

Although many factors have been found to be associated with caregiving behavior among preschool-age siblings, few studies have considered the older child's emotional responses to the distress of a younger sibling in the mother's absence. In this study, the authors considered both individual and family factors that predict older and younger sibling distress in a mother-absent situation designed to elicit caregiving behavior. For both older and younger siblings, the strongest predictor of distress following the mother's departure was distress in the other sibling, suggesting the importance of situational factors. Individual and family factors, however, were also found to predict child distress. Among older siblings, shy and sociable temperaments were associated with greater distress during the mother's absence. Higher levels of parenting stress were found to be associated with less distress among both older and younger siblings in the mother-absent situation. Results are discussed in terms of individual and family environment influences on the sibling relationship.     

The confluence model: birth order as a within-family or between-family dynamic?

The confluence model explains birth-order differences in intellectual performance by quantifying the changing dynamics within the family. Wichman, Rodgers, and MacCallum (2006) claimed that these differences are a between-family phenomenon--and hence are not directly related to birth order itself. The study design and analyses presented by Wichman et al. nevertheless suffer from crucial shortcomings, including their use of unfocused tests, which cause statistically significant trends to be overlooked. In addition, Wichman et al. treated birth-order effects as a linear phenomenon thereby ignoring the confluence model's prediction that these two samples may manifest opposing results based on age. This article cites between- and within-family data that demonstrate systematic birth-order effects as predicted by the confluence model. The corpus of evidence invoked here offers strong support for the assumption of the confluence model that birth-order differences in intellectual performance are primarily a within-family phenomenon.     

Birth order and personality: Some empirical findings and a biobehavioral theory

The birth-order variables assessed included sex and number of siblings, assignment to 2- or 3-child family for separate sample analysis, family position as appropriate to given sample, spacing effect—was the birth of the second child spaced 4 years or more after the first child—dominance relationships in the family, sex of nearest siblings, sex of other siblings as appropriate, whether raised by both original parents, whether raised by foster parent(s). The personality variables assessed included sociability, anxiety, dominance, superego, phlegmatic temperament, involvement, self-regard and other scales measured by the new Howarth Personality Questionnaire. Samples of 50 for the 2-child families and 58 for the 3-child families were analyzed and it was found that: (a) in the 2-child families eldest children were less cooperative than younger, that those reporting dominance by another sibling were higher in state anxiety and this also applied to the younger of the pair, that those spaced in birth order were less afraid of being socially unacceptable, that those raised by both parents were higher in involvement; (b) in the 3-child families those dominated by a sibling, regardless of position, had more hypochondriac symptoms (a sign of anxiety), and that those spaced in birth order showed less cooperativeness. A biobehavioral theory to encompass biological-hormonal spacing effects and dominance as well as other intrafamilial behaviors was proposed.     

Predictors of children's emotional distress in a mother-absent situation: implications for caregiving research

Although many factors have been found to be associated with caregiving behavior among preschool-age siblings, few studies have considered the older child's emotional responses to the distress of a younger sibling in the mother's absence. In this study, the authors considered both individual and family factors that predict older and younger sibling distress in a mother-absent situation designed to elicit caregiving behavior. For both older and younger siblings, the strongest predictor of distress following the mother's departure was distress in the other sibling, suggesting the importance of situational factors. Individual and family factors, however, were also found to predict child distress. Among older siblings, shy and sociable temperaments were associated with greater distress during the mother's absence. Higher levels of parenting stress were found to be associated with less distress among both older and younger siblings in the mother-absent situation. Results are discussed in terms of individual and family environment influences on the sibling relationship.     

同胞共情：特点、影响因素及理论机制

同胞之间的交流和互动更能促进彼此共情的发展。随着“全面二孩”政策的实行,同胞共情成为国内外研究者共同关注的焦点。本文在同胞的视角下总结了同胞共情的共性特点和特异性特点,从个体、同胞、家庭三个维度阐述了同胞共情的影响因素。未来研究需要进一步注重文化,回归本土研究;加强双向机制研究,夯实理论框架;重视干预性研究,探索提升同胞共情的方法。     

The Sibling Resource Dilution Theory: An Analysis

In this study, I examined relationships between sibling variables and children's family educational resources at different levels of family social status and children's intellectual ability. Data were collected from 900 eleven-year-old Australian children (450 boys, 450 girls) and their parents. Relationships among the variables were examined by plotting regression surfaces generated from models that included terms to test for possible linear, interaction, and curvilinear associations. Although results from some of the regression models provided tentative support for the sibling resource dilution theory, overall results suggest that acceptance of the theory must be treated with some caution. In general, the analysis indicated the possible complexity of relationships between sibling variables and family educational resources.     

The More the Merrier? Sibling Composition and Early Manifestations of Theory of Mind in Toddlers

Sibling relationships are argued to offer a rich social context for the development of young children’s theory of mind (ToM). There is evidence that the presence of siblings, particularly older siblings, may promote preschoolers’ ToM, but it has not been investigated among toddlers. This study evaluated differences in early manifestations of ToM between toddlers in different sibling compositions: 1) without a sibling, 2) with younger siblings only, and 3) with older siblings only. The sample included 227 toddlers who completed 2 tasks assessing their understanding of discrepant desires and visual perspectives. Results indicated that only children and those who had older siblings did not differ from each other on either task. However, on both tasks, toddlers with younger siblings performed significantly more poorly compared with those with older siblings. Moreover, children with younger siblings demonstrated poorer visual-perspective understanding compared with only children. It may be critical to take siblings’ birth order into account when investigating their respective effects on each other’s ToM, especially in toddlerhood.     

The confluence model: Parameter estimation for six divergent data sets on family factors and intelligence

Theoretical predictions, based on the confluence model, were made for data from six national surveys of intellectual performance. All six surveys relate intellectual performance scores to family configuration variables. Widely divergent patterns of relationships between the major family factors, such as birth order and family size, and intellectual performance scores characterize the six data sets. Nevertheless, the confluence model was capable of accurate prediction in all cases when all three parameters were estimated. Little accuracy was lost using only two parameters. Variations in the estimated parameter values that reflected the variations in patterns of effects could be meaningfully interpreted for their psychological significance.     

Childhood amnesia: on answering questions about very early life events

Twenty five young adults were asked about the events surrounding the birth of a younger sibling which took place when they were under the age of 2 years. Approximately 40% of the participants claimed to have significant memories of the events. The mothers of our participants verified that a majority of their answers were accurate. Comparing the pattern of data with those previously collected (Eacott & Crawley, 1998) suggests that the memories of those who were aged below 2:0 are qualitatively similar to the memories of those who were older at the time of events and dissimilar in type to those who are basing their reports on reconstructions from family knowledge. This finding may be evidence that memories of events that occurred before the age of 2 years are genuine but rare. This conclusion may be useful in assessing theories of childhood amnesia.     

Sibling dilution hypothesis: a regression surface analysis.

This study examined relationships between sibship size (the number of children in a family), birth order, and measures of academic performance, academic self-concept, and educational aspirations at different levels of family educational resources. As part of a national longitudinal study of Australian secondary school students data were collected from 2,530 boys and 2,450 girls in Years 9 and 10. Regression surfaces were constructed from models that included terms to account for linear, interaction, and curvilinear associations among the variables. Analysis suggests the general propositions (a) family educational resources have significant associations with children's school-related outcomes at different levels of sibling variables, the relationships for girls being curvilinear, and (b) sibling variables continue to have small significant associations with affective and cognitive outcomes, after taking into account variations in family educational resources. That is, the investigation provides only partial support for the sibling dilution hypothesis.