Rowe, D. C., & Herstand, S. E. (1986). Familial influences on television viewing and aggression: A sibling study. Aggressive Behavior, 12 (2), 111-120.

Abstract:  Examined familial influences on aggressive behavior and TV viewing in a survey of 26 pairs of brothers, 55 pairs of sisters, and 43 opposite-sex pairs, mostly aged 14-18 yrs. Same-sex siblings resembled one another in aggression and in their exposure to violent TV programs; opposite-sex siblings were dissimilar. The frequency of watching crime and action programs correlated nonsignificantly with aggression. Two other variables, however, were associated with aggression: identification with aggression and aggression consequences. These relationships also held between families (covariance of siblings’ averages) and within families (covariance of siblings’ differences). The latter relationship indicated that one sibling was typically the more extreme on both aggression and its correlate than a brother or sister. (19 ref) (PsycINFO Database Record (c) 2004 APA, all rights reserved)