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    We would like to thank Steve Messner and the anonymous reviewers for their helpful comments and suggestions. An earlier version of this paper was presented at the 2001 meetings of the American Society of Criminology. This research uses data from the Add Health project, a program project designed by J. Richard Udry (PI) and Peter Bearman, and funded by grant P01-HD31921 from the National Institute of Child Health and Human Development to the Carolina Population Center, University of North Carolina at Chapel Hill, with cooperative funding from 17 other agencies. Persons interested in obtaining data files from The National Longitudinal Study of Adolescent Health should contact Add Health, Carolina Population Center, 123 West Franklin Street, Chapel Hill, NC 27516–2524

  • Dana L. Haynie is Assistant Professor in the Department of Sociology at the Ohio State University. Her current research examines friendship networks and delinqueny, female homicide, and the connection between adolescent mobility and delinquency. Her recent publications appear in the American Journal of Sociology, Criminology, Social Forces, and Journal of Quantitative Criminology.

  • Suzanne McHugh is a doctoral candidate in Sociology at the State University of New York at Albany. Her research interests include peer and family influences on crime and deviance, the spatial distribution and nature of bias crimes, and the differences between organizational and index crimes.

Direct correspondences to Dana L. Haynie, Department of Sociology, The Ohio State University, 300 Bricker Hall, 190 N. Oval Mall, Columbus, OH 43210. Email:


Drawing on a large sample of genetically related pairs of adolescents from the Add Health, we examine the influence of sibling deviance on adolescents' participation in minor deviance compared to the influence received from mutual friends (i.e., friends shared between siblings) and influence from unique friends (i.e., friends unique to each sibling). Multivariate analyses that control for genetic relatedness using DeFries-Fulker regression (1985) indicate that after aspects of the shared and non-shared environment of siblings are accounted for, the heritability effect, capturing genetic relatedness in sibling deviance, is no longer significantly associated with deviance. The deviance of siblings' unique friends accounts for a large portion of the heritability effect of sibling deviance.