In the context of heightened global transnational movements and the proximate geographical positioning of Poland and Ireland, this study investigates the impact of the transnational nature of Polish families’ migration experiences in The Republic of Ireland on their family language policy. This research endeavours to address a gap in the literature surrounding the influence of transnationalism on family language policy within Polish-speaking migrant families in Ireland. Grounded in Curdt-Christiansen's [Curdt-Christiansen, X. L. 2018. “Family Language Policy.” In Oxford Handbook of Language Policy and Planning, edited by J. W. Tollefson and M. Pérez-Milans. New York: Oxford University Press.] interdisciplinary model of family language policy, this investigation draws on an ethnographic inquiry into three Polish-speaking families in Ireland. The study focuses on families with first- and second-generation migrant children. Data were gathered through a combination of semi-structured interviews and children's reflective language diaries. The results depict the transnational nature of family life, with recurrent travel between Ireland and Poland evident across all three families. To sustain connections with Poland, parents implemented specific language management strategies. The study underscored the participants’ recognition of the interdependence between the use of the Polish language and the continuation of connections with Poland, as well as the capacity to uphold family life across Ireland and Poland.