Good luck! I am probably your mom's age, maybe a little older. I don't have a roommate, but when my husband either dies or goes into a nursing home, I have thought I might get someone to live in the second bedroom, free or reduced rent in exchange for chores. (I'm elderly and disabled.) All of us would prefer to not need the extra help or the rent money, but most of us are not so independent.
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A finger in every pie.