She is now wanting to go home after living almost four years in my home with us taking care of her. I know it is for her to take care of him financially since I have cut his funds off. I have POA etc. I think he will convince her to call and have her retirement and social security checks to his account. Mom is very frail and unable to take care of her affairs or herself. I'm at a loss as to the next step with protecting her financially.
Did your Mom stay with your brother? Does she want to stay in her old home or live with your brother?
Since you have Power of Attorney, might be time to switch banks and have Mom's Social Security and retirement checks transferred to the new bank. Mom doesn't need to know.
But first make an appointment with an Elder Law Attorney and see what ideas he/she might have regarding the financial issues and your brother trying to make changes. Maybe you can use a different name on the account, something your brother can't figure out.
I do not know for a fact but I think he is pulling the "I am dying" routine yet I see him posting on Facebook pictures he has taken of surrounding area. I have change banks and believe I have all papers in order and now this. I'm tired of all of it.
I think there is also a term called representative payee or a process which can be discussed with financial/legal advisers as to how to best handle income/caregiving costs as well protect mother and you from allowing anyone from reducing her nest egg that is to be used solely for her care, the whole point of retirement income. Do a 1 year review of all banking, financial statements and consider running a credit check to determine any other suspicious behavior that can occur, open credit cards, loans, etc.
Sounds to me like you simplified the situation already but this is always an ongoing management issue where staying well aware of any loose ends from interfering with ultimate goal: take care of an elderly person diagnosed with dementia. Good luck!