The present study examined the factors related to attrition and treatment outcomes in the ACT-Raising Safe Kids (ACT-RSK) program. ACT-RSK is a family violence and child abuse prevention program for parents and caregivers of young children. Sixty parents or caregivers of children aged 9 years or younger completed the ACT-RSK group program and the research measures. The study took place at 7 community-based sites in the midwestern United States. Program completers were significantly older than noncompleters, suggesting that parent age relates to attrition from this program. Pre/post comparisons indicated increased nurturing behavior, decreased harsh parenting, and decreased negative discipline, as well as decreased child behavior problems following completion of the ACT-RSK program. Parent age predicted children's outcomes, indicating better results for the children of older parents/caregivers. In addition, pre-test harsh parenting scores predicted children's outcomes, suggesting that families with relatively higher initial levels of parental psychological aggression and corporal punishment had more robust child outcomes following completion of the program.