Family language practice can be significantly influenced by social, historical, and political contexts, especially in immigrant households where a society's minority languages are used. Set in a large city in Japan, this study examines how institutional power can affect Filipino mothers' language use at home. Drawing from the cultural historical activity theory, this study examines both individual and collective discourses. After conducting individual interviews, participants and I collectively engaged in workshops, the topics of which included child--parent communications at home, experiences of Japanese schools, and multilingual development. Interactions during the workshops revealed the characteristics of the collective discourse to mitigate the repercussion from the dominant ideology and indicated participants' heightened awareness toward a supportive parental community. The findings also highlight the paradoxical role of English for Filipino women in Japanese society. English served as a resource to empower these women, but its economic and political power also hindered them from using their first languages at home. This study highlights the institutional power affecting Filipino mothers' language use and suggests the significance of cultivating a supportive parental community.