I, the live-in primary caregiver, have suspected that my mother has had dementia for a while now. She has not allowed me to take her to doctor appointments or take control of her medications. Basically, she will not let me take care of her. My brother, who has power of attorney, has not done anything about it because he's been taking advantage of the situation. In addition to turning my mother against me, he has done some shaddy financial transactions. I was told that if it's determined he did them while she was incompetent, they can be reversed. Is this true?