* "I am shocked that you think you should be helped. You have made bad and weak and profligately extravagant choices and now you think the council will be able to fund a fresh start for you. As a tax payer who hasn't had a holiday for 7 years, and only got 1st car after much saving aged 44 I hope this isn't true. I am happy to pay taxes to support education, NHS, elderly, people in need, but not cases like this." *
.And that's precisely why you shouldn't have posted this in AIBU because you are going to get similar comments. And they have a point.
You need debt advice asap. You should never have just the man's name on a tenancy, (!!) especially when you have kds, and you should never allow someone to build up huge debt in your name but you have learnt this the hard way.
Might be worth looking into going bankrupt.
Then speak to the council. They would put you in emergency accommodation such as a hostel and advise you to privately rent as your housing banding would not be high priority.
It makes more sense for him to move out. Are any grandparents involved? They wouldn't want their grandchildren on the streets surely?
However hard things get surely the children cone first and why would a father who has got you into significant debt be happy to let you struggle with his kids ?

The things you have going for you are you do work full time and you don't live up North where council houses are now as rare as rocking horse shit.