I handled all of my mother's financial affairs from the time she came to live with me at 89, because by then she was legally blind, and I continued to handle them after she was in the nursing home, where she died at 102, so I didn't have the same concerns you have about her competence. However, after she died I did inherit all her personal papers and possessions, because I was an only child. I went through all of them mainly because I didn't want to discard anything without knowing what it was. I found a trove of old photos, including one I had never seen of me with my first partner, and funeral cards, my baby record books, hand-written genealogies made by relations, etc., which gave me information I would never have otherwise known.