The majority of men and women prison inmates are parents. Many lived with children prior to incarceration, and most have at least some contact with their children and families while serving their sentences. Because prison populations have increased in the United States, there has been a renewed interest in finding ways not only to reduce recidivism, but also to prevent incarceration in the first place, particularly among the children of incarcerated parents. Positive family interaction is related to both issues. The ongoing development of a multisystemic intervention designed to increase positive family interaction for parents and families involved in the criminal justice system is described. The intervention package currently includes a prison-based parent management training program called Parenting Inside Out (PIO); a prison-based therapeutic visitation program; and complementary versions of PIO designed for jail and probation and parole settings. Work on other components designed for justice-involved parents, children and for caregivers during reunification from prison is ongoing. Program development has occurred within the context of strong support from the State department of corrections and other key governmental and non-profit sector groups, and support systems have been established to help maintain the interventions as well as to develop complementary interventions, policies and procedures. (Contains 3 tables.)