By all means have them learn Cantonese/Mandarin/French/Spanish/Klingon/Dothraki/Whatever. Just make sure when they grow up they learn proper English grammar and word usage (wander/wonder
, whether/weather,
would have not
would of, accept/except, principle/principal, irregardless is not a word). If I still come across adults that do this the insta-snap generation isn't going to give a fuck. Don't let your kids grow up like that - I find that kids who grow up with parents who are ESL have this issue. Give them books and other respected publications and get them to read, read, read.