Multi-informant reports of aggression by siblings in families with and without a history of IPV were compared. Associations between aggressive behavior and child depressive and trauma-related symptoms, as well as maternal and sibling warmth were also explored. Mothers, observers and the siblings themselves reported on aggressive behaviour. Mothers reported on child trauma-related symptoms while children provided self-report on depressive symptoms and mother–child and sibling warmth. The frequency of observed aggression did not differ across groups on average, although more sibling dyads exposed to IPV engaged in aggression than those not exposed. Child reports of sibling aggression did not differ across groups but mothers reported significantly less aggressive behavior by children exposed to IPV than those not exposed. Regression results indicated that depressive and trauma-related symptoms were significant risk factors for aggression, while the role of mother–child and sibling warmth was more complex. Results were discussed within a developmental psychopathology framework.
