Objective: To expand the evidence base of the Supporting Father Involvement (SFI) intervention to include child welfare families. Background: Taking a preventive father-inclusive approach, SFI aims to strengthen coparenting, parent–child relationships, and child outcomes. This study replicates 4 prior iterations of the program using the same 32-hour curriculum facilitated by clinically trained staff, case managers, and onsite child care and family meals. Method: Participants (N = 239) included low-income (median = $24,000) coparenting pairs, typically mothers and fathers/father figures, half of whom were Mexican American, with toddlers (median age < 3 years). Questionnaires assessing multiple family domains were administered verbally over an 18-month period. Intervention effectiveness was tested through a randomized control trial with immediate treatment or waitlist–control groups using a moderated mediator structural equation model. Results: The model explained 49% to 56% of the variance in children's problem behaviors (intervention and autoregressive effects). The intervention reduced couple conflict, which reduced anxious and harsh parenting, leading to better child outcomes. The intervention was equally effective for community and child welfare–referred families and family dynamics pathways were similar across conditions. Conclusion: With its intentional outreach and inclusion of fathers, SFI offers an effective intervention for lower risk child welfare–involved families. Implications: Results argue for the utility of treating community and child welfare parents in mixed-gender prevention groups that focus on strengthening multiple levels of family relationships.

Despite the benefits for children and families of fathers who are involved positively with their children, most parenting programs in the United States and globally focus on and collect evaluation data from mothers almost exclusively. Engaging fathers is still viewed as a complex endeavor that is only somewhat successful. In this article, we summarize what is known about engaging fathers in parenting programs, then argue that programs are most effective when coparenting is the focus early in family formation. We rely on two decades of the Supporting Father Involvement program as an example of an initiative that has been effective at recruiting and retaining fathers and mothers in various cultural and national contexts. When programs are inclusive in content and focus on process, are sensitive to differences within and across families, and recognize parents as experts on their children, they are more successful in recruiting and retaining diverse groups of fathers and families.