By applying the tripartite framework of Family Language Policy, this study seeks to gain insight into heritage language maintenance of a Polish transnational family in Melbourne. To this end, an integrative investigation of FLP encapsulating the heritage language ideologies and practices has been employed. Based on the data collected through the online questionnaire administered to a wider cohort and supplemented with an in-depth interview, quantitative and qualitative analyses have been conducted to obtain the sociolinguistic picture of the convoluted dependencies. This research delves into how Polish is maintained as a HL by the second generation of Polish-speaking immigrants. It explores the Polish community, one of the well-established yet understudied group that makes up multicultural Australia. It unfolds an account of the dynamics of FLP, illustrating how they are constantly negotiated, contested, and formed by parents. The interviews were recorded, transcribed verbatim and coded according to the Grounded Theory Approach. The recurrent themes were noted. The existing social patterns were conceptualised through the process of constant comparison. The excerpts selected for analysis illustrate how critical have been the informants’ ideologies and practices concerning heritage language maintenance. The data analyses of the researched families disclose a wide range of practices where certain discrepancies are observed between declarations and the actual language behaviours. It also emerges that without parents’ reinforcement and establishing the HL as a default means of communication at home, children suffer from lower productive skills.