Article Parental intervention style and adult sibling conflicts: The mediating role of involvement in sibling bullying Genevie ` ve Bouchard Andre ´ anne Plamondon Myle ` ne Lachance-Grzela Universite ´ de Moncton, Canada Abstract Managing conflicts and aggressive behaviors between siblings is challenging for many parents, and parental responses to sibling conflict has been shown to influence the quality of children’s sibling interactions. Building on previous work on parental involvement in sibling conflict, the aim of this study was to investigate the mediating role of sibling bullying perpetration and victimization during childhood and adolescence in the rela- tionship between parental intervention styles and conflicts in young adults’ sibling rela- tionships. A sample of 302 individuals aged 17–33 years participated in the study. Results of structural equation modeling confirmed the proposed mediation model of young adults’ sibling conflicts. More precisely, parental control and parental noninvolvement were positively associated with experiences of sibling bullying perpetration and victi- mization, whereas parental coaching was associated with lower reports of sibling victi- mization. Involvement in sibling bullying during childhood and adolescence was, for its part, associated with sibling conflicts in young adulthood. Results of the current study confirmed that parenting intervention styles can influence children’s involvement in sibling bullying, which in turn, can predict conflicts in adult sibling relationships. In line with the family system theory, these results underline that parents can inadvertently play a role in the development of dysfunctional sibling relationships. Corresponding author: Genevie `ve Bouchard, E ´ cole de Psychologie, Universite ´ de Moncton, 18 Antonine-Maillet Avenue, Moncton, New Brunswick, E1A 3E9 Canada. Email: genevieve.bouchard@umoncton.ca Journal of Social and Personal Relationships 1–18 ª The Author(s) 2018 Article reuse guidelines: sagepub.com/journals-permissions DOI: 10.1177/0265407518793227 journals.sagepub.com/home/spr J S P R