When it comes down to it, I'm a Prime descendant also through their son Thomas II. As far as I can tell, Thomas Pier was never married to anyone else. It's just a lot harder to find stuff about the Primes, as you can tell.
I noticed that the writer of the Web page Ruth and I use says, regarding Sarah Prime, "Thank you, Dear Lady, for your courage!" Maybe he meant because Sarah had the courage to put up with her husband, since he seems to have been quite the, er, colorful character.