We (parents) speak Cantonese to kids, helpers speak English....one of my kids has a speech delay and now at four, she's bilingual...though her english seems to be better...the other one is speaking more in english, but can do equally well in Cantonese. They go to a Cantonese/English speaking kindy...two teachers, same format as home...for some it may take a bit longer, but don't worry it'll come along, it has even for my speech delayed one.