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Ann M. Minnett, Deborah Lowe Vandell, John W. Santrock, The Effects of Sibling Status on Sibling Interaction: Influence of Birth Order, Age Spacing, Sex of Child, and Sex of Sibling, Child Development, Vol. 54, No. 4 (Aug., 1983), pp. 1064-1072
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Minnett et al. (1983) studied this question.
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