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The purpose of this paper was to investigate genetic and environmental contributions to significant child actor effects (the tendency to behave in a similar way to all family members), child partner effects (the tendency to elicit similar interactions from all family members), and sibling relationship effects (factors unique to the sibling dyadic relationship). Genetic influence was found for actor effects for conflict and self-disclosure about postive things. In contrast, dyadic relationship effects for warmth and self-disclosure about both positive and negative things showed no genetic influence. Moderate shared environmental influences were found for both actor and sibling relationship effects. However, most of the environmental influences for both actor and sibling relationship effects were of the nonshared variety, suggesting that unique environmental experiences are important for children's familial interactions.