I'll be teaching my kids Chinese from the moment they come out of the womb. Then when they're older I'll have language partners. Not only will I be speaking to them in Chinese, I'll be exposing them to Chinese movies, Tv shows, music, and stories. Maybe I'll get them a tutor as well. My girlfriend's parents speak Spanish but they waited to try teaching it to their kids instead of just using it from the start which didn't work out very well.