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I am not positive, but it may be that your Alvin C. that you mention is my ggg He married Sally Lovelace in 1843, and I am trying to prove she is their daughter. She is Louisa Koger Gregory b. July 1847 d. 1929/30 md. William R. Gregory 14 Oct 1864. I think the children of Alvin C and Sally are as follows: Louisa, Calvin b1848, Charles b1854, George b1855, William b1859, Serilda b1857, Isaac b1844, and John b1846. If that connection is right, then Alvin's parents are probably William B. 1782/4 in NC/VA and Polly.
Not sure if we can help each other or not. Feel free to e-mail me.