thanks for the tips. Daniel - that's pretty cool - at the very least, your oldest will be able to understand a ton. I don't think my Chinese is good enough to speak it all day, but luckily my in-laws are around and have been trying to speak as much mandarin as possible. They're sorta like the 3rd parent.

I just ran into a 2.5 year old who can understand everything in Chinese and in English. His parents to do exact same thing - mom's always in Chinese, dad's always in English.

I gotta wonder, though, do the parents who don't speak that second language start to feel left out?