Background: Recent research has suggested that intergroup contacts with out-group members can both reduce prejudice and is associated with attitude change. Aim: This study extends prior work in Northern Ireland to examine parental and schooling effects on children's attitudes in a post-conflict environment. Sample: A large-scale cross-sectional survey of secondary schoolchildren (N = 1,732) and their parents (N = 800) in Northern Ireland assessed the effects of in-school and out-of-school intergroup contacts on intergroup attitudes. Method: Multivariate analysis of variance was employed to examine associations between children's political attitudes and parental, group membership, school, and contact variables. Conclusions: The results suggest that parental attitudes, group membership, and cross-group contacts explain the majority of variance (58%) in children's political attitudes. The findings provide a comprehensive account of the factors that influence children's political attitudes within a deeply divided society and offer teachers and educationalists a way to improve community relations in a segregated society.