Welcome to JustAnswer!
I am Nancy and I'd like to help. Could you please just clarify some things for me first?
With whom is he living right now?
What are the delusions?
What rapid decline is he experiencing?
Who is he being aggressive toward?
Thanks for writing all that for me. It helps me to understand... You mention a social worker... how is she involved? And, if she is aware of the situation, why has she not intervened? I am also left wondering if it's possible that he has bipolar disorder... it sounds as if it could be, but without an evaluation right now, it would be hard to know. If you do get him in somewhere - make sure they check that out. Just so you know, if he is found to have a mental illness, he maybe eligible for benefits because he will be mentally disabled. Check that out for your State.
I agree with the Social Worker... that until something happens, or if he refuses a voluntary evaluation, there is little you can do --- unless you trick him. I have seen people call the MD, tell them what's going on - bring Dad in for a "regular checkup" and have the MD evaluate their mental status without making a big deal of it. It may also halp you later - if eh declines even more. But you are 3 hours away... so if that's not possible... you may have to wait.
The good news, though - is that it sounds as if you are coming up on a natural intervention. You said they are about to take his house. Either you, your sister or the police will be responsible for moving him out. So - take advantage of this. Let him know what is going to be happening. Tell him he can go with you - taking what he wants, or putting it in storage - or the police will work on behalf of the bak and remove him, alone without his belongings (some of which I am sure he is quite attached).
Let him make that decision - he will most likely refuse to go willingly with you. If that's the case, you can either move his most loved belongings out for him (and keep them for him until... whenever). But at some point, the police will show up to move him out. When that happens, his mental status will be apparent and they will place him on a hold and he will get some help.
That certainly isn't the best way to go, or what to rely on - because if he gets violent, he could get hurt, or charges could be filed... so, you may have to just take advantage of the foreclosure - and move him out.
Even if you have to tell him that time is up NOW (even if he has a few more weeks), but just to get him out safely and into a new place while you all have access to the house.
If he cannot afford a new place- maybe you have to seel some of his blongings in order to move him, but either way, it sounds as though he needs a secure place to live - like a retirement village with other people his age, where they can administer and monitor medications, and where he can be social.
If I think of anything else, I'll write, but for now,work on getting the Social Worker involved in getting him to accept that he has to move, and finding a new place for him.
You are welcome.
I'll keep thinking.... if I come up with anything, I'll let you know.