This chapter examines and compares data from Iranian immigrant families’ language ideologies, language management, and language policies in four different diaspora communities. In doing so, it aims to generate knowledge about the ongoing interactions between family language policies (FLP) at the micro-level and the societal language policies and discourses at the macro-level in four different contexts. The diaspora perspective contributes to the study of an immigrant group from the same origin, but in different contexts, under different societal circumstances, enabling the examination of other external factors influencing home language maintenance and multilingual development. The chapter reviews the factors shaping and reshaping family language policies in four countries: the U.S., New Zealand, the U.K., and Sweden. We broaden the perspective of FLP research by going beyond parental language ideologies and management efforts to also include the dominant societal policies and ideologies in constructing immigrant families’ language practices and policies.