For family accomodations plus skiing, I agree with Summerrun on the Leavenworth area skiing at Stevens. Only negative in my mind is Leavenworth is a decent drive from Stevens.
Crystal a close second with a fair amount of local cabins, find places near each on Craigslist/vacation rentals. Mission Ridge has a lot of rental properties around too.

Crystal has new high speed Gondola this year that "Totally Kicks Ass" According to my Brother. I'm headed up there over the holidays with my girls.
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You know something bad is going to happen when you hear..."Hey, hold my beer and watch this"