Mother knows her birthdate, children, the year, who is president, knows she does not want to be without me by her side. She knows the extent of her estate, where her money is kept, the approximate value. We were in a bad position up until now. Brother has made major life decisions for Mother when he is not the sole Trust of her Trust and he is not Power of Attorney of her Health Care. She is Trustee unless she is incompetent and then he and I are co-trustees. He has not recognized me as a co-trustee of the Trust until now. I am Mother's sole POA of Health Care. He has pretended and taken liberties as though he is sole Trustee of her Trust and when he, a cousin and a rogue facility outsted me and tried to take over her Health Care, she almost died. We weathered the storm and my son and I got her out of there to a very loving facility where I have been staying with her. It has been a year. Mother's physical health and mind have greatly recovered in this last year with me at her side. Confident, Mother and I went to an Elder Attorney. He asked Mother several questions for which she knew the answers. She didn't know the answer to "Do you know if you are the Trustee of the Trust?" She didn't know what it is to be a Trustee of her Trust. The Attorney helped us in some matters. We had a phone call with Brother. Brother now understands that he and I are co-trustees of her trust and that I am the Sole Power of Attorney of her Health Care. That part is good. It was expensive to sort that out. My question is: what is the bright line for competency for a 100 year old? The attorney asked her what she wanted and Mom said, she never wants to be without me. I think the Attorney would protect Mother and I if Brother tried to separate us in the future but I am not sure. What do I need to know to best protect her?