I know many children raised with two languages. It is easier for the children than the rest of the family. From all that I have seen and from teaching ESL to children, I would say that the most important part is making it clear who speaks which language. If you always use Chinese with the child and the father always uses English. This prevents confusion of mixing the languages. My Grandfather's parents spoke German. To make sure they spoke English my Great Grandfather had a firm rule. "To your siblings and me you will speak English. With your Mother you will use German so that you will never forget it." Even without more than 6th grade educations the children all became successful business people fluent in English. My Grandfather associated with Mayors, Senators and Movie personalities and his English was excellent. This syystem works better and faster than any I know. It gives the child clear cut immersion in both languages. Happy Child Rearing