Child Welfare Capacity Building Collaborative: Congregate Care in the Age of Family First highlights the importance of high-quality, customized congregate as lifesaving for children and youth with complex clinical or behavioral needs who require a short-term stay in a residential treatment facility. The 2018 Family First Prevention Services Act (FFPSA) reinforced appropriate use of congregate care through an emphasis on family-based placements and the development of qualified residential treatment programs (QRTPs). Trauma-informed care and meaningful family engagement are hallmarks of these residential programs, strengthening practice and improving treatment outcomes for children and youth with serious clinical or behavioral health disorders. The resources in the Congregate Care in the Age of Family First series can help child welfare agency leaders, program managers, and mental health professionals: (1) Better understand the congregate care provisions of the FFPSA; (2) Learn how various provisions of the FFPSA apply to congregate care; (3) Explore the important roles of family engagement and trauma-informed care in residential treatment programs. The resources provided can be used individually or with a team to gain a foundational understanding of the congregate care provisions of the FFPSA.