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)

Subjects were eight first-graders with older siblings, half from 2-child families and half from larger families. The four sex combinations of sibling pairs were equally represented. Half the children were aided on the task by their mother; half were aided by their sibling. Comparisons were made by sex and family size. nAuthor/JH)