We now have results for the first three participants in the DNA project. The results are promising.
The three people tested come from different lines: Thomas Rigsby c1760 of Mecklenburg Co NC and TN [R14 in my database], Lewis Rigsby c1784 of Chatham and Surry Co NC [R26], and my James Rigsby c1755 of Wake Co NC [R05].
The samples for Lewis and Thomas were identical on 12 markers, and James differed by only one. This shows that all three men were closely related, but of two different ancestors. Their branches should join up about 11 generations back, which is roughly the time of the earliest Rigsby immigrants.