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Current work on children's individual characteristics and family processes that contribute to variation in sibling relationship quality is reviewed. Findings from these studies are summarized in a heuristic model that specifies hypothesized links among family processes, intrapersonal characteristics, and variations in sibling relationship quality. The model is designed to provide researchers with a host of hypotheses to test and refine in future studies. The contributions that sibling relationships may make to cognitive and psychosocial development are then reviewed, with a suggestion that sibling relationships comprised of a balance of both prosocial and conflicted interactions create experiences that are most likely to nurture children's social, cognitive, and psychosocial development.
Gene H. Brody (Sun,) studied this question.