OP, you sound amazing.
Boo hoo for him and his jealous mid life crisis.
He knew what you did.
You tried to help him.
He stop and started, but booze and casinos were more appealing.
You are paying for everything, including a nanny?
His aunt is back up?
You are away max 5 days?
You take over completely when home from him?.
He makes pin money from his business?
He had three years of a booming business when you did it all at home?
He sounds spectacularly immature.
A real man child.
Jealous of your success which he could have pursued, but he bottled it, for booze and blowing his money.
It is utterly ridiculous of you to suggest selling your home and renting to fulfill a manchilds dream.
Give your head a wobble and put your childrens housing security first.
I don't know of a single woman with a husband working away who comes home and fully takes over, much less a nanny and an aunt staying.
I think he needs to sort himself out and start focusing on how he grows up, stops feeling so sorry for himself, and hard done by, especially in this economy.
Definitely some therapy, but he needs a shake.
I did 3 years of a husband travelling, without a nanny or aunt, I wasn't working because I wanted the children to have one constant, but I might have swapped if I had that level of support available, most particularly a family member.
No it wasn't always easy, but he definitely has the best case scenario going on for a parent doing it.
Do not jeopardise your childrens security by doing anything to negatively impact your career.
Your children need one sensible, realistic parent.
Well done.