RecruitingBehavioural interventionDigital Support Strategies for Caregiver Home PracticeThis project is a pilot trial of the Engaging Families home practice smartphone application (or "app") as an add on to a family-based prevention program. Although there are many evidence-based preventive interventions delivered to caregivers to prevent youth substance use and mental illness and promote youth positive family and youth outcomes, the impact of these interventions is often limited by low home practice of intervention skills among caregivers. The Engaging Families home practice app is a digital behavior change intervention that was developed to support caregivers in practicing intervention skills at home. Researchers will ask participants if the app was acceptable and feasible for daily use at home. Researchers may also compare how often caregivers who use the study app do home practice of intervention skills compared with caregivers who do not receive the home practice app but are encouraged to use an app to help schedule their activities.