Hi all, Zax, I'm actually glad this topic came up!
First let me just say that I definitely agree with Penelope. And also agree that one parent, one language is a good approach for the kids. I have a 4 year old daughter and a one year old son. My daughter speaks 3 languages fluently (English, Finnish and Vietnamese) and my son understands 2 at the moment (Eng & Vnmese). I know they seem to be totally different languages and it has not seized to amaze me how well they've learnt it. I myself grew up with three languages simultaneously (English, Vnmese & Filipino) (Long story
Anyhow, don't be discourage with the kids' languages, if they can communicate with you that is already very good. Remember that their progress is always individual.
I can share some experience here if it might help a bit and give some encouragement.
I think the most important thing about being bilingual or multilingual is actually having ONE language that is stronger than the rest. This language will be the one that the child will base its understanding of other languages on. I think this is the reason why at some stage the child will have a dominant language. In most cases of bilingual children at some point between the ages 2 and 4 when they start to speak, they will chose one of the languages to master. After a certain period of time, they will be using both. But not right away. Most of our friends are also mixed and have bilingual children who have all done this. Most of them have Finnish as the other language and most have let Finnish dominate. I know of only one case where the child chose to speak English.
Hope that was not too much to read. But before I stop, I think it would be nice to meet up with other English speaking kids of the same age. We don't have so much of those around, so anyone Interested?