Unfortunately even though you have a POA you will likely need to go to court for a guardianship and/or conservatorship if you want to re-gain control. The court proceeding would require a finding of incapacity, and after that point you would be back in control. Worst case scenario, this puts your aunt and brother in front of the court and makes them justify what they have been doing, and also gives your mother some say in her treatment. Good luck.
Glenn R. Matecun
www.MichiganEstatePlans.com
Michigan Probate Attorney | Michigan Estate Planning Lawyer
Toll Free: (888) 487-6150