Her dr. Declared her incompetent. My dad had a stroke 10 years ago and can't talk. He knows what's going on. He can express he's mad , he can say yes and no. But I'm sure that's not enough. Mom was and still is his poa. Im Mom's medical power of attorney. I pay their bills and I'm their caregiver but what happens now...to their house, their savings and checking? My brother already stole their car and computer.
You say you have reported this to APS.
They investigated and do not think anything can/should be done.
If that's the case, then simply keep reporting what you know and let them know that when something ultimately happens the fault is on them and you will take the number of times you can called to your local council on aging and congressman/woman. Keep records and diary.
There are human rights involved here. And when there is found to be sufficient legal competency the law will not intervene. Sadly that isn't your choice. You have done what you are able. Simply keep reporting.
If truly you find that you cannot intervene you need to legally resign your POA. It becomes a worthless piece of paper at some point. These things usually come to a head with hospitalization of a catastrophy that leads to death.
You can but TRY to intervene in this for the safety of your Mom but if you find you cannot then going to an attorney to resign POA (which is how it must be done in incompetency) will put this before the courts and it is on them to decide whether to give state guardianship. At least you will know it has ALL been reported to all authorities that can possibly intervene.
They may be able to help you get emergency temporary guardianship with just a phone call from a Judge; I have seen it done in my nursing career. You can then get documentation you require and get permanent down the line, but this will allow you to function.
If your Mom has cognitive awareness enough to make you POA and understand it, you can still do this in a doctor's office. You need to get yourself on accounts as POA and only signee or brother will take everything. He should be reported to APS for elder abuse so this doesn't continue.
Call APS.