ABSTRACT This ethnographic article examines the interactional processes through which Tibetan-Canadian heritage language learners agentively construct their linguistic identities in everyday family interactions. Because food is centrally involved in family routines, as well as broader cultural practices and the articulation of individual tastes, talk about food provides a site for analyzing negotiations of individual agency amid expressions of shared identity. Drawing from previous language socialisation scholarship that approaches family meal times as a resource for constructing identity, this paper analyzes children’s conversations at meal-times, during food preparation, and about food preferences. Through interactional analysis of twelve months of longitudinal video ethnography in two Tibetan-Canadian families, I found that, in these activities centered on food, children used multilingual and multimodal resources to negotiate authority over their cultural and linguistic knowledge. Specifically, children agentively displayed their knowledge of Tibetan language forms, elaborated on their capacities to participate in cultural activities, and instructed parents about their individual preferences. By analyzing these interactional displays of knowledge through the concepts of agency and co-operative action, I argue that children construct their identities as speakers of Tibetan, despite the dominance of English in their language repertoires.