Yes...
+add natural hot spring visits to your Mammoth option. My kids loved that....and also at Mammoth we never really experienced crowds there...mountain is really spread out and lots of terrain for all abilities off most lifts....its wide open for lots of family options to keep an eye on all the kids.
Our kids (and adults would love the hot springs too! As far as crowds, were you ever there during the LA spring break week? That’s the reason I was fearing crowds, otherwise, spring is pretty quiet mot resorts.