In recent years, the child welfare field has devoted significant attention to siblings in foster care. Policymakers and practitioners have supported efforts to connect siblings via shared foster placements and visitation while researchers have focused on illuminating the empirical foundations of sibling placement and sibling intervention in child welfare. The current paper synthesizes literature on sibling relationship development and sibling issues in child welfare in the service of presenting a typology of sibling-focused interventions for use with foster youth. The paper provides two examples of current intervention research studies focused on enhancing sibling developmental processes and understanding their connection to child welfare outcomes. The paper concludes by presenting an emerging agenda informing policy, practice, and research on siblings in foster care.