This paper examines how children and teachers negotiate the official Turkish only language policy as they manage their linguistic resources (Turkish and Kurmanji) in one Turkish preschool serving predominantly emergent bilingual Kurdish minority children. Using a critical ethnographic lens to language-in-education policy making (Martin-Jones and Da Costa Gabral, in: Tollefson, Pérez-Milans (eds) The Oxford handbook of language policy and planning, Oxford University Press, 2018), the study investigates how children and teachers navigate locally situated language practices and language ideologies that accord legitimacy and authority to standard Turkish and officially invisibilise Kurmanji in the preschool. Findings indicate that acting as agentive social actors teachers and children do not merely comply to the Turkish only language policy but they also adapt, recast, and contest it in social interaction. They stress the need to rethink the language-in-education policy in the Turkish educational system in ways that recognise and leverage teachers and children's entire linguistic repertoires and experiences for teaching and learning.