Raising bilingual children and achieving additive bilingualism have become increasingly common goals for many parents. However, the methods to achieve these goals remain unclear. The current study explores the potential impact of Singaporean parents’ attitudes and proficiency in Mandarin and English on their own language use and their children's language proficiency. Twenty-one mothers with primary school-aged children completed a set of questionnaires about their perceptions of bilingualism, language use at home, and dual language proficiency. Maternal interviews, each lasting approximately half an hour, were conducted by two research assistants. The audio recordings were transcribed and thematized. Both the survey data and the interview results indicate that maternal attitudes and beliefs about bilingualism are generally positive (e.g., most parents believe that being bilingual is beneficial for children's cognitive development). However, it was found that maternal language proficiency varied among participants, which in turn affected their language use and instructional strategies with their children at home. Bilingual mothers tended to use their stronger language more frequently and employed more diverse strategies when communicating with their children. Maternal and child proficiency also has an impact on maternal well-being. The interview data revealed that some mothers felt anxious about cultivating bilingual children when they believed they could not provide sufficient support for their children (e.g., due to a lack of proficiency to use the language with their children).