I don't know how the school systems are in Canada, but in my town the children at a very young age have to take spanish. I have an eleven year old who's been taking spanish since the first grade.

Most children shows are english and spanish. As a result my younger children (4 and 3) speak spanglish. I don't know if it's normal for the younger kids to mix the languages or not but mine do.

I and my husband speak english but I can pick up some spanish words and understand what they are saying (do to the childrens tv programs).

So if you speak both languages and the children are going to have to learn it in school, I would say expose them to both languages as much as possible. Just watch out for the mixing.

Sorry for rambling!