This article examines Vietnamese ethnic minority students' experiences of language choice in communication with people of different ages and in different relations to them in their family and ethnolinguistic community. Concepts of power, solidarity and marked and unmarked choices are adapted to examine the students' strategies of language choice. Interviews with a group of students are used as the main data source. Findings suggest that the mainstream language was set up as the generational solidarity code among young members while the L1 was considered the power code associated with older members of the family and community. These emerging patterns of language choice may result in disruption of everyday in-group language practices among different generations and perpetuate language shift. It is suggested that explicit L1-promotion policies in the community and minority language support in public domains may encourage young people to engage in language management efforts and empower minority languages in the polity.