Re: Any ideas for what to see in Quebec?
Quebec, great choice. Its a really great choice if you're between the ages of 17-25....but I won't get into that.
I would definitely hit Montreal first .Try 'old montreal' area, St. Catherines street for some general city putzing and then head over to St. Denis Street for dinner. Lots going on.....like a constant festival in the spring and summer. Check out the 'big church' (Notre' Dame)....wow, really something.
Then I would head up the river (St. Lawrence) to Quebec City (a few hours drive). Its very historic....equally good food, and lots to do on foot. Find a good place to park (in both cities) and just walk around if you can. Stay away from the suburbs....they are a drag like any place.
How far along is your son in French? (French classes or immersion?). Most people you will deal with (hotels, tourism, restaurants, etc) will easily speak both english and french. They appreciate it when people do their best to converse in french and are quick to help.
These are great cities to have around...by all means check 'em out, you won't regret it.

BP
ps: before you go....read up on what major street signs look like in french..because thats what they read as. No 'avenue' or 'street', etc...all french. So make sure you are clear what 'Rue' means, etc.