Intelligence and Sibling Relationship

Associations between relationships in sibling pair and cognitive skills were studied. The sample included 160 full families with two children of adolescent age. Family relationships diagnostic techniques and intellectual test (WAIS and WISC) were used. Elder children were shown to be more predisposed to conflict dominant behavior towards their siblings than younger ones. Antagonism in sibling pair was related to low levels of parents’ acceptance and emotional closeness between parents and children. The children with low IQ score are more likely to dominate in sibling pair. The firstborns who demonstrate higher IQ scores are more likely to cooperate with younger sibling.