I have been caring for my grandmother for more than 10 years now, her daughter who has lived far away for more than 30 yrs. and has only visited less than a handful of times throughout all these years, recently came to manipulate her mother into giving her power over her finances. My grandmother has the beginning stages of dementia and is very vulnerable. I whom all these years never even dared nor attempted to control her money suspect that her daughter is using her own mother's money for her own benefit. How can I protect my grandmother and report her daughter? The problem is I have no solid proof.
Her daughter (your aunt, right?) apparently thinks she is the person who should do it. I think it makes some sense that as the caregiver you should do it. But if GM is still competent to make decisions then it is definitely her choice who to give DPOA to. You have no proof of wrongdoing. What makes you suspicous?
Is it your mother or your father who is a child of your GM? Is he/she living? What is their role in GM's life? Are their other children?