RecruitingBehavioural interventionImpact of Parental Emotion Regulation on the Treatment of ADHDAim: To examine if parental emotion regulation (ER) moderates the response to parent training interventions. H1: Reduced parental ER capacity will predict diminished efficacy for behavioral parent training to improve negative parenting behavior (NPB) and behavior problems in offspring with ADHD. H2: Increased parental emotional reactivity will predict diminished efficacy for behavioral parent training to improve negative parenting behavior (NPB) and behavior problems in offspring with ADHD.