Estranged brother has possible dementia, is calling me for help saying his wife isn't feeding him or providing him his medication. What can I do?

First let me say, I can't help him. A little history as to why. I took care of my mother, emotionally and financially for many years, first when my father left her after 40 years of marriage and continued to do so after she was diagnosed with dementia until she passed at the age of 89 in Nov 2022. My brother refused to or claimed he couldn't help her or me with the care of our mother even though he lived 10 minutes from her and I live 3 hours away. He said he didn't have the time or the money to spare. All this time he was driving expensive cars and his wife was sporting designer clothes and Louis Vuitton bags. I on the other hand was paying for my mother's care for the last 17 years of her life. I paid her mortgage payments and other bills and the last 2 years of her life at a memory care facility until she passed. Because of this and without any knowledge to me, she left me her house.

Oh and my brother and his entire family did "NOT" attend my mother's funeral even though they knew about it because I told them when and where it was going to be.

So now my brother calls me. Speaking to him, I noticed he is a little off. Cognitive issues are obvious. He is 61 yrs old. He tells me he hasn't been working for the past 1.5 years because he has been sick. He has been living off his disability payment and his 2 401K but all that was controlled by his wife and is now depleted. His wife has applied for social security disability for him but he doesn't know what that status is. He says when the money is there everything is good but now the money is gone, all she does is yell at him. He says she feeds him hotdogs, and cup of noodles, she won't refill his blood pressure medication and tells him he doesn't need it or she doesn't have money to fill the prescription even though it cost $17.00 for a 90 day supply. She stopped paying his credit card bills and now all the credit card companies are calling him for payment. He says he owes about $20,000.00 to credit card companies but he doesn't remember getting most of those credit cards but they are in his name.

She transferred all of the money out of their joint checking account so he has no access to any money. She took away all the car key so he can't drive anywhere because she told him he wasn't allowed to drive because he was sick. When he asks her what she means by that, she got angry and told him to get the hell out of the house and never come back. She has cancelled all his doctor's appointment and has kicked him out of their bedroom so now he sleeps on the couch. She recently had a birthday party at a friend house and told him he wasn't invited.

Here is the major concern. He said he had a friend go and pick up his blood pressure medication for him and his wife found out and was livid. She made the comment, "Well if your friend is going to take care of you now I don't have to and if you "Die", it won't be my fault."

I don't think he caught onto this, but I think she want's him to die so she doesn't have to deal with him anymore. He has asked to come live with me but I can't take him on. I am not in the position to do so emotionally or financially and honestly, I still have 4 kids in college 20 and under I need to think about their wellbeing. He has 2 adult kids a son and daughter but they most likely won't help him. So I guess I am asking what are his options?