RecruitingBehavioural interventionHospital-to-Home Transitional Care Interventions (H2H-TCI) Children/Youth With Special Health Care Needs (CYSHCN)Aim 1: Compare the effectiveness of focused dose vs extended dose hospital-to-home Transitional Care Interventions (H2H-TCI) on health service use and parent-reported confidence for hospitalized CYSHCN. Aim 2: Compare the effectiveness of focused and extended dose H2H-TCI among vulnerable CYSHCN subgroups. Hypothesis: Both H2H-TCI arms will improve primary outcomes more for CYSHCN with higher versus lower clinical complexity; while extended H2H-TCI will better mitigate racial/ethnic outcome disparities than focused H2H-TCI. Aim 3: Evaluate implementation context, processes, and mechanisms via a multi-phase mixed methods study design.