Objective: To explore the direct and indirect associations among GenerationPMTO (i.e., the “Oregon model” of a parent management train-ing program), child behavior problems, and parent outcomes. Background: The behavioral parent training program GenerationPMTO is designed to improve child behavior outcomes. Although parent well-being is not targeted, previous studies have found collateral benefits on parental well-being for GenerationPMTO in preventive low-risk samples and high-risk samples. Method: Bootstrapped structured equation models were used to analyze 2 randomized trials that evaluate parent well-being (mental health, somatic health, and vitality) in 2 versions of GenerationPMTO: Brief Parent Training (BPT) for a preventive sample (N = 216) and GenerationPMTO, which was higher-risk and a mix of a clinical and a preventive sample (N = 137). We examined direct and indirect effects of treatment condition for parent well-being via change in children’s behavior problems, change in parenting practices, and level of parenting self-efficacy. Results: Six months after treatment, results revealed positive effects on targeted child and parent outcomes in both samples, whereas only the BPT intervention had direct effects on parent well-being. Conclusion: Collateral benefits in the low-risk BPT sample suggest that helping children and their families at earlier stages of negative development may increase the potential for immediate collateral benefits. Implications: The results highlight the preventive potential of a brief behavioral parent training intervention based on the social interaction learning model.