Beatpeace, you can't do what you can't do. What you can do is look to your children's security and your own.
Once I read a story about a man struggling in the water. Bystanders summoned a skilled swimmer, but the swimmer just watched the man flail at the water. When the man began to sink, however, the swimmer dived in and saved him before he could drown. Later, people asked the swimmer, "Why didn't you save him immediately?"

"Had I attempted to save him while he was still struggling in panic, he could have drowned us both. I waited until the man exhausted himself. Only then would he not struggle against me helping him."
I don't know. This is a heartbreaking situation; I agree -- you are out of options, save to stay or go. Seek the advice of those you trust and know you best.