Purpose: The present thesis aims to gain insight into parents’ perceptions of their children’s agentic role while raising them in Greek-bilingual families. The study was conducted within the field of family language policy and family bilingualism. Methods: A small-scale, qualitative study was designed, which included semi-structured interviews with parents of bilingual preschoolers, residing in Patras, Greece. Six participants were interviewed and audio-recorded. Then, the transcriptions were translated into English and finally analysed using thematic analysis. Parents were interviewed regarding their children’s use of languages concerning to the possibility to influence changes in their everyday lives as bilingual families. Results: According to the findings of this study, parents within Greek-bilingual families argue that their children negotiate their own language acquisition and the language use of the adults around them. Specifically, parents think that their children a) influence parents’ confidence in the chosen language policy, b) resist to inconsistent language use, and c) influence the parents’ language use. Conclusions: The present thesis highlights what parents within Greek-bilingual families think about their children’s agentic role regarding influencing changes in the family language policy and the socialization of members of the family. The small-scaled study entails that the results give the readers an insightful account, instead of absolute truth. Results of the study motivate further research on the agentic role of children in Greek families and its implementation on how childhood is experienced.