This is very helpful. I am researching the Dwiggins family (Robert b. 1770 d. 1856, married to Martha Crews, son of John Dwiggins d. 1815) in Stokes and Rowan counties in NC. I have also been researching the Maryland families to make the connection.
I would love to talk with your son about his research and how he got "across the pond" (found the records in England).