This paper discusses immigrant parents' attitudes toward their children's bilingual development. The data presented here were generated from a study with Brazilian families, residing in Japan, whose children were attending Japanese public elementary schools in Osaka and Hyogo prefectures. Results reveal that though most Brazilian parents aspire to have their children both maintain Portuguese and acquire Japanese while in the host country, some parents are unaware of their roles and responsibilities in fostering this bilingual development. Moreover, findings show that there is a clear gap between what parents believe to be true and what they actually prioritize through their behavior. In conclusion, it can be argued that immigrant parents' greatest need is in knowing how to help their children achieve biliteracy.