You dont have anything to worry about. You dont owe them anything!
If your worried about your boys... What you need to worry about is them seeing how lazy his family is... Do want him to grow up knowing that? Of do you want him to be hard working and not rely on the government to take care of him.
THey sound like ignorant fools... You dont owe them anything. Not only did their son/brother die but they need to realize it was your husband, the father of your children.. They need to understand that Whatever money they think you got from Insurance or anything that its to go to the kids. Not them!
Girl Get your stuff and go!!! Get out of there as fast at you can!