Can I suggest something totally off the wall?
One of you could enroll in college classes. Find a full university in another state...it's the perfect time to file for financial aid. With you not working and children present even both of you could be full time students. Him taking evening classes and working during the day and you taking day classes and kiddo's getting free child care with child care assistance. If he didn't work you could both be students and the kids would either be with you or him.
Live on campus, they have apartments, condo's, and more if they are a full size university. I lived in married student housing and my financial aid paid my rent in full for the whole year before I got any money given to me.
I also got food stamps and child care while I was in class. It was the easiest time of my life, no stress about bills what so ever.
OU and OSU, in Oklahoma, both have campus housing. Oklahoma's not all that far from home but far enough they aren't going to drive her every weekend or even every month. Enough distance to have a life but close enough to go home during Christmas break and vacations.
Going to college is a good reason to leave home. They can't blame you for going away for to better yourself. I hope you'll consider this as an option. You only need to bring the clothes, minimal kitchen tools, and electronics you'll need for school. Most rent the apartments furnished. That means bring sheets and bedding, hangers and clothes, toiletries, and what you'll need in the kitchen to cook.
Minimal fuss, minimal lifestyle, big payout once graduation happens.