So the father removed his daughter as a health care proxy, is not contacting them, discharged himself, is not following medical advice but in your opinion is just going to happily move right in with them. I'm guessing you have some anger in you from being in a similar situation, but you don't know enough about this one to be preaching.

That said, Op I hate bringing this up but is there a possibility he has gotten into a problem with substance abuse? It's a pretty familiar story when someone stops paying the mortgage. Addiction is one of those things that can definitely over power the need for someone to pay the mortgage, especially for a year.