The influential role of parents has long been acknowledged as a key contributor to children's bilingual development. Parents' home-based informal efforts to foster children's bilingual abilities are described as family language policies (FLPs). The important connection between bilingualism and FLP has been established, but to date there are few studies concerning Korean immigrant families in Australia, highlighting their unique cultural values. According to traditional Korean cultural values, mothers play a central role as An-hae (the sun inside) to facilitate their children's language development (Kim, 2006). This study aimed to create a clearer picture of Korean mothers' beliefs about bilingualism and their FLPs. The participants were six Korean mothers with their children attending a community language program in Sydney. There are two data sets for this study: a six-weeks' FLP daily log of each family and a focus group interview. A thematic analysis of these data revealed the richness and specificity of FLPs for bilingual development. This paper concludes with implications for a future research agenda.