Unless you can't afford it, and depending on the size of your family, you'll regret not staying right in the Village at the base of Tremblant. There are plenty of cheaper places that are a shuttle or short drive away, that are also very nice, but the Village is such a fantastic place, that you'll be kicking yourself for not staying there if it fits what you're looking for.
There are many places in the Village such as the St. Bernard, Johanssen, Marriot, etc. Just be prepared for some sticker shock.
With a family though you can save a lot of money just by skiing in for lunch because the on-mountain food is pretty expensive, even in USD prices.