Objectives: Describe the advance care planning communication preferences of children and adolescents and young adults (AYAs) with serious illness and their families. Describe multidisciplinary clinicians' current approach to advance care planning communication as well as perceived facilitators and barriers to initiating advance care planning discussions with AYAs and parents of children with serious illness. Discuss opportunities for further research to improve advance care planning communication for children and AYAs with serious illness and their families.