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Abstract
Most prior sociological research on siblings explores their effects on educational, cognitive and social outcomes. This study focuses on personality traits and extends its scope to early adolescence. Using the eighth-grade data from the Early Childhood Longitudinal Study-Kindergarten Cohort (ECLS-K), it tests the relationship between number of siblings and three personality traits: internalizing problem behavior, self-concept, and locus of control. The results suggest that sibship size has only a modest effect on personality traits among early adolescents. Specifically, only those adolescents who have at least four siblings are found to have significantly worse internalizing problem behaviors, worse self-concept, and worse locus of control compared to only children. In addition, this study finds little evidence that adolescents benefit more from sisters than brothers. Lastly, compared to having older siblings, having younger siblings is more beneficial for personality traits in predicting self-concept and locus of control.
Acknowledgments
I thank my mentor Dr. Douglas Downey, and my dear colleague Dr. Donna Bobbitt-Zeher, for their useful comments.