How can he buy a home that is owned by my neighbor of 60 years who is in being cared for by a governmental agency?

She is 101 years old and has been incapacitated for more than 7 or 8 years now. Her home is listed on the tax rolls to be owned by her and the guardianship. She does not have any heirs that we are aware of and does not have a will. No one lives in the home, her husband and only son are deceased. Her home is a very small home and deteriorating before our eyes. A family member of mine would like to consider purchasing her home.