Yakama Nation Behavioral Health Services System of Care - The Yakama Nation (YN) System of Care Expansion (SOC) grant will serve Native children and youth, birth through age 21, at risk for or with serious emotional disturbance (SED) and serious mental illness (SMI), and their families. The geographic catchment area will be Yakima County (YC) with a specific focus on the lands of the Confederated Tribes and Bands of YN. YNBHS will increase access to evidence-based and culturally appropriate mental health services by expanding crisis stabilization services including intensive care coordination; increasing providers' capacity to deliver culturally relevant, evidence-based services as well as trauma- and grief-informed services; coordinating with YN Tribal School; and engaging children/youth and families in all levels of the SOC. The SOC expansion grant will increase YNBHS’ capacity to deliver culturally relevant evidence-based interventions, integrate traditional healing practices into the YNBHS and YN Tribal School, and strengthen referral pathways between YNBHS and its tribal partners. The YN SOC will serve approximately 250 unduplicated children, youth, and young adults at risk for or with SED/SMI across the 4-year period. The grant will achieve the following goals. (1) Strengthen YNBHS SOC governance structure by improving coordination with the YN Behavioral Health Coalition Board. (2) Increase YNBHS SOC capacity to provide culturally appropriate intensive care management services to children/youth with SED/SMI who have experienced a mental health crisis. (3) Increase YNBHS capacity to provide culturally relevant, evidence-based/practice-based(EB/PB) or community-defined interventions to Native children/youth at risk for or experiencing SED/SMI. (4) Enhance YNBHS and YN Tribal School’s capacity to identify and address trauma (including intergenerational trauma), grief, and loss in children/youth at risk for or with SED/SMI. (5) Increase family and youth engagement and involvement in the development, implementation, and evaluation of the SOC.