This article aims to examine how sociopolitical changes impact language ideology and linguistic practices within transnational multilingual families with a particular focus on families with ties to Poland in post-EU-referendum Britain. Drawing on the survey and ethnographic interview data collected as part of the ESRC-funded Family Language Policy project between 2017 and 2019, we found that the public attitude towards Polish and Polish speakers have changed significantly following the Brexit vote. While general lack of security and disappointment were reported by most families, the first-hand experiences of discrimination and violence were reported particularly among those in socioeconomically underprivileged positions. Despite these changes and differences, however, Polish speakers and families continue to hold onto the promise of multilingualism, carrying on with their language use and learning practices. These findings demonstrate the multilingual reality and resilience in family language policy and practices at the time of crisis and have wider implications for understanding influential factors underlying family language policy.