Hello, I don't know anything about them but I do have a certificate of a Ann Blythyn's marriage to a William Tucker and a certificate of their daghter Mary, I thought they were my ancestors but they turn out, not to be, my ancestors names were John Tucker and a Ann Hall and their daughter's name was Mary, so you can see the slip up I had. William & Ann Blythyn came from Stackpole Elidor ( so did mine ) and they were married 1829 their daughter Mary was born 1831 at the same place.
If you want I can send you these certificates if they are in your family, let me know if you want them.
Rhiannon