Dave
How easy we're divorces in this period and how expensive?
I also have the feeling that my dad's generation of my family would have known. My Uncle Harry (He's really a first cousin of my dads) knew his granddad, their eldest son, reasonable well but it's certainly a possibility. His mother was the eldest of her generation and a formidable lady and I think she was in touch with Soloman.
(Saying that my dad never realized, that one of his maiden aunts who used her mothers maiden name was illegitimate, and she was living with him and his parents when she died.)
If I could find Anne's Marriage I would also feel a sense of achievement. She was baptised on the 25 May 1817. I did wonder if Martha might have been visiting her mother in 1891 and if I knew her surname I could check for errors in the census.
Paul