Because my in-laws speak to him in mandarin already...helper speaks to him in English...and I speak to my helper in English too....i speak English and Cantonese at home....but then later I think he's confused with 3 languages. He doesn't speak much words...so later I just limit my Cantonese speaking at home.
Thanks for you suggestion! I still do speak to him in Cantonese for some basic....and I heard it's best for one designated person to speak one language only! Our difficulty is I have to speak to helper in English too! So he's hearing mammy speaks both Cantonese and English.....but I have to admit that his exposure to Cantonese is insufficient! So I try to get him in LS instead...before going to the States 10years later...we'll see...