This study examined the effects of aid from mother and older sibling on the problem-solving behaviors of 120 first graders. Children with older sisters showed more advanced problem solving after aid, while those with older brothers did not. Interpretations in terms of family interaction patterns are offered. (JMB)

Compares the interactions of 20 firstborn and 17 lastborn children with their parents and siblings. Children were observed at home for five 45-minute sessions. Oldest children differed from youngest children in emitting more behaviors to parents than to siblings and in receiving more negative responses from parents and siblings. (Author/CB)

Interactions were observed as 80 mothers helped their first-grade children on an object-sorting task in the presence and absence of a third-grade sibling. (JMB)

One hundred sixty sibling pairs from two child families were sampled for sibling interaction behaviors as they relate to measures of categorization style. The study provides additional evidence of the importance of a child's siblings to his cognitive development. (Editor/RK)