Yea it is really tough.. I had to hire an attorney take it to court where they the court hired a Guardian ad Litem who interviewed my father reported to the court and I was granted Guardianship!!!
I had to get guardianship for my father. At that point his dementia was so bad I don’t think he ever realized what happened. It was gut wrenching for me. You will need an attorney even if everyone knows it is necessary and agrees.
You are in my prayers.