Susan - I would love to have the image of the portraits. My email firstname.lastname@example.org. As if it weren't coincidence enough that you posted your query only a month before I started looking, I grew up in St. Davids. My mother still lives in Haverford. She will be thrilled with this discovery! I think I remember some McCowns. Any lawyers in your family?
Unfortunately, I have to burst your bubble about St. Lawrence being related to the Massachusetts Adamses. We tried hard over the years to make a connection, but our Adams came from Ireland.
Have a nice vacation and please get in touch when you return.