None of the five have a birth year for Francis Franklin.
I work with a woman whose mother is 20 year older than her father. I know it does happen. However, it was rare for anyone to marry a woman 10 years his senior in the mid 1800's. The usual pattern was a woman 2 - 4 years younger for first marriages, anywhere from 5 - 30 for the second one. When you write to the five, you might want to acknowlege the age disparity and cite your sources.
Along those lines, she may have lied about her age in official documents. One of my ancestors shaved 4 years off her age in a couple of places so people wouldn't know she married a man 6 years younger than herself. So, if you are looking for her in a data base, give the birth year range more lattitude than you normally do.
I'm not related. I find answering genealogy posts more satisfying than crosswords puzzles.