detection of the role of early disrupted child behavior (impulsivity/activation) as a mechanism through which genetically-influenced child attributes influence their rearing mothers’ hostility, which in turn predicted children’s later ADHD symptoms. As such, two pathways to prevention are identified: via interventions that aim to reduce hostile maternal parenting behavior, and via interventions that coach mothers to identify children’s early disruptive behavior and respond in constructive ways that break evocative patterns.