This is a very tragic story. I can certainly understand your anger. I would suggest counseling for you and your family. I would hope your mom and dad would as well.

I have a friend in a similar situation, except the dad is already deceased, otherwise it is the same story. And the mom is the enabler. They haven't tried to get the son evicted yet, but I know they would like too. Hopefully, it want come to the tragic ending yours has.