i'm always a bit wary of parents treating childhood language acquisition as a project - language fluency requires practice and interest to keep up, and pushing a kid to learn a language when they don't care can be counterproductive. many of my second-generation immigrant friends are now effectively monolingual because of that.

personally, i was raised bilingual, switched to full english in grade school because my parents were concerned about my english skills, and now i'm in a weird limbo where i'm technically still fluent in two languages, but i have bad first language attrition in one and i'll always feel like a non-native in the other. that being said, i'm glad that i still have access to two languages, and i hope that his daughter can find continued success as she grows older.