His grieving seems extraordinary. My mom was my heart and when she died I grieved but moved on. Did he have unresolved issues with her? Does he feel guilt? As a preacher one would think he would find solice in the fact his mother is now with God. There is some underlying isssue here that he needs to address but what? I wouldn't want my father in law every day so don't feel bad about that. Is there a senior center near by where he could get active in? Does he have any friends he could spend time with. Hopefully this daily involvement will be temporary. I can see how all of this could be too much. You're going to have to concentrate on being good to yourself cause you can't change what they do. Keep posting here. It's a great place to vent. I'd be having fun decorating if I were you.