Early Harsh Parenting Shapes Adolescent Bullying through Sibling Pathways: A Longitudinal cohort study of Dynamic Family Processes

Using Millennium Cohort Study data, we modeled harsh parenting from ages 3–7 and linked these trajectories to sibling and peer bullying in adolescence. Smaller declines in harshness predicted greater aggression, with sibling bullying mediating effects. Findings highlight how early family coercion cascades into wider social contexts.