Welcome @thawyzard. I'm glad you jumped into this conversation and adding your thoughts. It sounds like you speak from personal experience. Are you or have you cared for someone with Alzheimer's?
We look forward to getting to know you.

Thanks for your response. The psychiatrist has not yet said he's a danger to himself, however he is making major financial decisions and not remembering he made them (such as buying a house, adding/removing people from wills, etc.). How a real estate agent would let someone that clearly does not remember having a conversation about the sale of a house, actually let that person buy a house, is beyond me. With this next big financial decision they're doing to make with this move, we're concerned that he's not even being rational anymore. But the family is also too timid to step in.

In Florida there is a legal statute called The Baker Act, with the Baker Act people who are incompetent, dangerous to themselves or others can be evaluated. They can be involuntarily hospitalized. I believe there is such a statute in the state in which you reside. You could take him hopefully to a large Metropolitan Hospital with the psychiatric unit, and ask for that evaluation. Have a discussion with the evaluating psychiatrist beforehand and explain the monetary mistakes and they memory problems and explain to the doctor why you wish to have this involuntary status placed on him. After that evaluation the psychiatrist can involuntarily hospitalize him and have consultation with the proper M.D. so that he may be started on the proper medication. shortly thereafter he can be released to someone's care. Once he is ruled incompetent, the court does this, it is a legal proceedure, he can be prevented from signing legal documents and from engaging in Business Without a court-appointed guardian to make sure that he makes good decisions.