My kids are growing up in a, well... trilingual home. And soon, another two will inevitably kick in.
I speak French with my husband (who's mother is French), but since my parents are both Portuguese, I decided to stick with Portuguese at home, which is the language I feel most comfortable with. But then we live in Israel, so Hebrew will also come naturally. I used to wonder what was going to happen exactly, because it does sound confusing, even for an adult!
Well, he's 19 months now and he's speaking a bit of all three languages, though he seems to choose the easiest words of all three when he tries to say something. Kids are clever.
One thing I didn't want to do, was to introduce him to yet another language, English... it just seems way too much at this point.
I believe that at one point or another, one language will dominate over the other, because it always depends of how strongly the kid is exposed to it. This doesn't always happen equally.
My toddler is starting to understand that with some people, it's hebrew, with me, it's portuguese and with daddy, it's french.
Just some time ago, I called up my toddler (in portuguese), with no success, then I casually called I'm up in french... well, he came running and looked at me very surprised!
He knows only dad talks that way.
I've also read that when children learn more than one language, they develop a "second brain", another whole way of thinking to fit the way that other language is understood (with all it's nuances and meanings). Anyone heard about this?