This study investigated the complex mechanisms underlying team-based delivery of person- and family-centred care (PFCC) in geriatric home care. Using a realist synthesis approach, an evaluative framework was developed and populated with 159 references from scoping the literature, consulting Canadian experts in PFCC, purposive searching in PubMed/MEDLINE® and Cumulative Index to Nursing and Allied Health Literature (CINAHL), and reviewing grey literature within Canada. References were selected using a two-person review and/or consensus approach and quality appraisal. Data were extracted and synthesized using context, mechanism, and outcome configurations into a theoretical framework of team-based PFCC in geriatric home care. The framework details the predominant discipline-specific contributions of nurses, occupational therapists, and physiotherapists, their collective contributions through communication in the context of a virtual team, and the system-level support required for comprehensive team-based PFCC delivery. Findings from this study could inform improvements to PFCC education, best practice guidelines, and more integrated delivery of PFCC in geriatric home care and other team-based care environments.