Interesting that your mother is a Clark. My gggg grandfather , Thomas Fuller's grandson was Apollos Clark Fuller and I always wondered if there were Clark's related that he was named after?
Thomas Fuller b ca 1775 married Ana Nancy Briggs in 1802 in Putney. She is the daughter of Hezekiah Briggs a descendant of Clement Briggs of Plymouth Colony.
Please let me know if you find a connections.