Family language policy (FLP) is increasingly recognised as a distinct domain of language policy concerned with the family as an arena of language policy formulation and implementation. While FLP is a relatively new research area, its conceptualisation of family and language practice requires re-examination due to social changes and technological developments, including the expansion of digital communication within families and the rise of globally dispersed families a product of global migration and transnationalism. In this systematic review of migrant FLP research, we investigate how the notions of family and language practice are conceptualised in research. Following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, we identified a total of 163 articles for analysis. Our analysis reveals that the majority of studies were conducted in nuclear families, i.e., those consisting of a father, a mother, and one or more children. Studies also tend to conceptualise the family as fixed and physically located in one place. Paradoxically, around half of the studies acknowledge the presence of geographically dispersed family relations, but this does not necessarily affect their conceptualisation of what comprises a family. Language practice was conceptualised as physical and face-to-face communication in 51% of instances, with only 11% incorporating an analysis of digital communications. Based on our review, we recommend that FLP researchers researching migrant families reconceptualise the family as geographically dispersed and language practice as digital and multimodal when necessary. Such a reconceptualisation will help researchers understand the hitherto underexamined contributions of dispersed family members and multimodal digital communications in migrant FLP.