OK, I will try to assuage curiosity without going into too much detail.
It's really obvious to both my wife and I that FIL might be suffering from dementia of some type's onset. He was having a hard time putting thoughts together, is sure his suggestion is being used because the company is still in business, has a conspiracy theory about why he hasn't been paid his millions yet. And knows that my wife won't mind being fired because of all the millions he will have to share with everyone. It was just generally unpleasant.
The legal advice is to see what we can do if anything to help the person who has poa set it up so FIL can't access enough money to bankrupt himself.
I am SO sorry. My mother resisted and fought for a few years against the thought of dementia, and it made things very difficult for me (I'm her only child, so nobody to share my woe with). Now that she's progressed far enough, she KNOWS her brain is not her friend, and she's grateful for all I do, and that aspect of things is much better.
When I moved her into assisted living, she gave me the check book and asked me to straighten things out, which is partly how I realized just how much she had deteriorated. She asked for it back, but I told her she couldn't keep track of anything anymore and I would be paying her bills from now on. I got POA on the checking account and her medical at that same time. That went on for about a year, with her being somewhat combative about me having the checkbook, and THEN she decided she was going on a cruise in Greece to see ancient archeology sites. Needless to say, she wasn't in any physical condition to do that, and it took months before I was able to get the money back, and I was very lucky to be able to do so, as she'd bought and paid for the trip after the last refund date! THAT was when I took away her debit card. The fact that the rent check to the facility bounced because she had bought the trip was just icing on the cake...
It was NOT a fun time, needless to say.
I wish you and your family the best in getting his affairs safely handled. It is a nightmare.