I second the southern VT areas. Best bang for the buck and drive, especially with kids. Bromley may be smallish, but it is great for the type of skiing you're looking for. Very family friendly. Mount Snow too. And not too far from Stratton, Okemo, and Magic.
Second I'd say Lake Placid/Whiteface for the reasons stated above. It's just a fun place for families and plenty to do on non-ski days with all the Olympic facilities and relatively modestly priced hotels/resorts. There's plenty of terrain there for everyone, but not as many long green runs as the other mountains.
Unless you stay at the Mount Washington Hotel, Bretton Woods is kinda far, but would be good for your needs. We rode out Hurricane Irene at the Mount Washington and my daughter still talks about it as her favorite hotel ever.
Quebec sounds good, but the car ride would kill me.