I have a few pieces, but not very many. Some more pieces may come back to me. I don't have any records that go back, though my cousin, Diane, has apparently done quite a bit of research. Here's the little bit I have.
John Davis Swygert, Jr.'s (my dad's) mother was Regina Thebaut from Jacksonville, Fl. His father, as you stated, was John Davis Swygert. His father and possibly his grandfather before him owned a furniture store in Columbia, SC. My dad's first marriage (39 years) was to Beverly Corinne Vaughn of Columbia, SC. Bette was his second wife, and Pearl (Bette's first cousin) was his third wife. He lived in Gloucester, NC with both Bette and then Pearl.
Dad did have a bill of sale for a burial plot that a family member purchased sometime in the mid 1800's. My sister probably still has that. I'll see what else I can remember. Patty