Using 2003 nursing home data from the Minimum Data Set (MDS) database, this study investigated the role of family support among nursing homes serving residents with a mental health history. Exploratory factor analysis was used to create and test a conceptual model of family support using indicators located within the MDS database. Families were found to be in regular contact with their relatives and supportive of their care. In nursing homes, daily contact, an ongoing relationship, involvement in assessment, and being responsible for the resident constitute the model family support. This study advances the understanding of family support in nursing homes and conveys information to guide practice through proposing ways to enhance family support and involvement in nursing homes. (Contains 9 tables and 1 figure.)