I don't understand, in 10 weeks you've moved to your mums, moved the children schools then moved them back, he's sold the family home and bought a new one, and now you're moving back to the new home? That's a very quick turnaround, how on earth did you organise all of that in 10 weeks?
I think you need to take a step back and think what you're dragging your kids, and yourself, through. You can't move them schools to decide in a weeks time it's not working and move them back, it's cruel and they won't know which way is up.
You need to be responsible here and stop the back and forward, shifting halfway across the country carry on.
If you want to put up with a drunk, so be it, but it's not a life for you or your children. You already moved, you'd did the hardest part.
I would take your mum up on her offer, move back, and start a fresh life there with you and your family around you. Forget the belongings, it's only stuff and it can all be replaced in time. You need, badly, to get some stability back and that will not happen with him.