Abstract
A study of siblings tested a relational dynamics model set in the family and based largely on Belief Systems Theory. Participants (N = 351) in a 3 (biological relatedness) × 2 (participant sex) × 2 (other sibling sex) quasi-experimental design evaluated their relationship with their sibling. Path analysis was used to track the effects of the independent variables on verbal aggression and verbal comforting. Mediating variables completed two distinct processes. The egocentric assertion of power and hostility between siblings mediated a sequence related to selfish emotions within the individualistic affect system. This sequence is anchored in parent–child verbal aggression and culminates in sibling verbal aggression. Empathy and strength of sibling bond mediated a sequence related to prosocial emotions within the cooperative affect system. This process is anchored in parent–child closeness and ends with expressions of comfort between siblings. The results provide an explanation for the emotional ambivalence of sibling relationships.
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