Genetic and environmental influences on maternal and sibling interactions were examined in 67 mother-child-child triads from nonadoptive families and 57 mother-child-child triads from adoptive families (in which both children were adopted and genetically unrelated). Triads were videotaped in 6 play settings in their homes. In addition, each sibling pair was observed in an unstructured setting in the home, and mothers completed an interview about the sibling relationship
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Rende et al. (1992) studied this question.