well, my 5 years old son speaks tagalog before we were here.. now we've been here for more than 4months, he speaks english very well. everytime i speak to him tagalog he answers me back in english. and he already forgot some of the tagalog words.
i talk to him and also to our new son english mixed with tagalog. just because i'm having nosebleed talking straight english
kidding aside... i thinks it's best to teach them our own language too. they might not speak tagalog but at least they will understand the language. so wether we are here or in Pinas, no one can fool them