thank you all for comments..
Old-Biscuit you are correct, the family property has not had regular USPS mail service in over 30 years. I could get it set up there, but it is rural and not a secure place to have mail delivered when I was away. Even when my grandparents lived there 40+ years ago, they had mail delivered to local PO Box so that they didn't have to worry about it. There is a physical address, that I am sure I could actually get from the county tax office.
gafidler, the suggestion of using my brother might be an alternative for some, but as he has his own issues, plus will be closest to respond if something happens with Mom, I would rather not burden him. (Besides he is not very technically literate... it would take days to get him to scan and email something if I needed it LOL.)
