She was at my sister's house and he manipulated her. He signed her up for hospice CMO. I am a nurse and I never experienced this situation. Scheduled morphine, depriving her from eating, etc. She is fading and I expect the worst. He took it upon himself and had no intention to tell me. If it wasn’t for my sister I would never have known. My mother was requesting to go outside for fresh air but the nursing home is running to call him. He said nope, it's like a jail for her.
Why did your brother stop you from visiting? Were you trying to feed your mom against medical direction or take her out of the nursing home? Maybe if you reach out to your brother and agree to follow the rules of the facility and the hospice doctor or nurse you can visit again.
My condolences on your situation. Geaton has a good idea about asking your brother for a supervised visit. Good luck.
Facilities are mandated reporters for abuse. I don't think there's anything you can do BUT if you wish to visit your Mother, ask your brother if he'd be open to a supervised visit so he can see you are only there to visit her and not stir up trouble.