FF, What you have described about the man's brain being fried, where words that came out of my mouth many years ago about my xh. Your h is having a difficult/severe mlc. He's truly gone off the deep end and if he ever wakes up, he's going to have a lot of damage to deal w.
About the girl, it's not only incest, but she's a minor. That can be looked upon rather badly as well. Whether she consented or not, it's looked upon as a type of statutory rape in my area. Your h has really lost his mind over this girl. BTW, the comments he has made to you are very typical of someone who has had a severe melt down. He really does sound a lot like my xh right down to the words/comments.
FF, I would continue to fight for the back child support and I certainly wouldn't let him off the hook for any monetary responsibilities. I know it's a rough road to travel and you cannot rely on his family to support you in any way. Blood is always thicker than water and they will never see things your way. Do you have family in the area? What about friends?
I'm very sorry you are here, but you are amongst some the finest, compassionate people. Each and every poster is on a journey that was shoved upon them, but we all have heard the same comments, seen a lot of strange behavior, been a party to the damage that has been done to us and our families and yes, we've managed to rise above the ashes. You will too in time. Take it one hour at a time, one day at a time and know that no matter what happens, you will survive and become wiser than you ever thought you would be.
Please take care of yourself and your family.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.