This chapter proposes that the ways in which transnational migrants and refugees mobilise kinship during their migration journeys can be examined through a concept we call the 'migration-kinship nexus', which focuses on the intersection of kinship, migration and aspirations. We go beyond a static, nation-state bound perspective on transnational families by focusing on a flexible concept of kinship and on refugee journeys rather than on families across nation-states. In our study of the kinship-migration nexus, we draw on Carsten and analytically distinguish between: 'kinship as being', kin relations that derive from birth and relate to individuals' past; 'kinship as doing', how kin relations are performed in the present; and finally, 'kinship as becoming', how kin-related aspirations regarding the future are formulated. Our research is based on two multi-sited ethnographic research projects with Afghan and Iraqi refugees conducted in 2011-2015 and 2017-2019 at various points of their migratory journeys: in Iran, Istanbul, Athens, Lesvos, on the Balkan Route, and in Helsinki, Bergen and Oslo. Our analysis demonstrates that while the migration-kinship nexus is shaped by European nation-states' increasingly restrictive migration policies and bureaucratic borders, kinship remains a flexible source of aspiration for migrants. Thus, the kinship-migration nexus concept encourages a deeper understanding of how migration and kinship are co-constituted and how kinship is central in understanding aspirations during the migration process. Our research demonstrates that kinship is a dynamic force that is not only about being, but also about making and unmaking in the present, as well as about becoming in the future.