Psychological Well-Being and Family Functioning in Middle Childhood: The Unique Role of Sibling Relational Dynamics

Despite being the longest relationships across the lifespan, the sibling dyad is the most under-studied relationship in the family system. Researchers have documented the harmful and beneficial effects of sibling relationships and family dynamics on individual well-being. Extending this research to middle childhood, the current study examined family functioning, sibling relational dynamics, and self-reported adjustment and internalizing symptoms among 8- to 11-year-old children. Path analyses revealed significant direct effects between conflictual family functioning and children's psychological well-being. Significant interactions between family functioning and sibling dynamics suggested that congruent relational dynamics at multiple levels of the family system had a cumulative impact on the child's well-being. Findings from the current study highlight the role of family functioning and the unique contributions of sibling relationships to children's functioning, suggesting that consideration of sibling relational dynamics may improve treatment planning by pointing out additional targets for intervention and/or potential sources of support.