Court mandated treatments for perpetrators of domestic violence have become the norm, however the efficacy of these treatments is questionable and most do not speak to the broader needs of batterers and their families. How batterer's treatments might impact parenting and father-child relationships and the psychosocial functioning of children is vastly understudied and not currently understood. Since batterer treatments are court mandated and require tremendous financial and community resources, the efficacy of these interventions in stopping the cycle of domestic violence and improving the health and well-being of the batterer, his partner and children is crucial. There are currently NO evidence-based treatments that address co-morbid substance abuse and domestic violence perpetration with emphasis on paternal parenting and the father-child relationship. Consequently, the proposed psychotherapy development project will develop and evaluate the potential efficacy of a novel, relational parent intervention for fathers with co-morbid substance abuse and IPV who have young children. The goals of this intervention are to decrease aggression and substance abuse by increasing focus on fathering and an improved father-child relationship.