I'm pretty sure that
1) Doc is under contract for next year,
2) Doc had at least a vague idea how old his kids were when he signed said existing contract (paying around $4 mil/yr?),
3) Doc stated publicly when he took the Celts gig that he would consider moving his family to Boston to be closer to them, but then didn't,
4) The appropriate thing to do would be for Doc to keep to his contract, as it binds both sides.
I'm also pretty sure that
1) Thibs was beat out for various head coaching gigs over the last couple of years to less than ideal alternatives,
2) Thibs has never been an NBA head coach,
3) There is likely a good reason for both 1&2 above,
4) Breaking in a new NBA head coach is not a recipe for title contention.