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Good to hear from you, but you are way out of my league. My ancestors all left between 1807-1828! Some continued business relations until the 1850s, but by 1865 they had forgotten they had Dinwiddie roots. I would think it fairly easy to trace persons in the twentieth century, and there are yet Abernathys in Dinwiddie who know the territory. If you wish to pursue the matter, e-mail me, and we will see if we can get you in contact with them.
By the way, my original message was an attempt to start some dialogue about Aberne(a)thy families in the eighteenth and early nineteenth centuries. I now a lot more than I did then, but am still unable to account for the proliferation of lines in the second quarter of the eighteenth century and define the the relations of David, Charles etc. to the original line of Robert I, II and III. When you get there, I am eager!