Hello Doug - Thanks for the contact.I really don't know anything about your John H. McBeath, unfortunately, though I recall seeing his name on one of the genealogy trees at the Reunion last summer, so you'll have to try to make the next one this coming August.
My brother Bill compiled this info some years back: Andrew, "our" New World Progenitor, b. about 1733, married Sarah Clinton, and they had 5 children that Bill could find: Robert, b. 1763; William, b. 1764; Jane, b. ????; Mary, b. 1771; and Andrew, b. 1775.Bill and I are descended from this Robert b. in 1763.
We think this Robert and his wife Frances Dunlop had 10 children, two of whom were sons named Andrew, b. 1795, and John D., b. 1797.Robert and Frances also had these further sons: William, b. 1799, Moses, b. 1804; Archibald, b. 1806 (from whom Bill and I are descended); James, b. 1808; and Robert S., b. 1812.
The "uncle John" (b. 1790) and the William C. you mention as brothers, and "our" Robert's two sons with the names John D. (b. 1797) and William (b. 1799), were born apparently in the same generation as your "uncle John" and William C. (Clinton?), but are not likely to be the same people.Do you suppose your William C. could be a son of the William b. in 1764 who is the brother to our Robert b. in 1763?That's purely speculation, of course.
Considering that the progenitor Andrew was born in 1733, and your "uncle John" was b. in 1790, this John and his brother, William C., are probably not this Andrew's sons.More likely his grandsons.
As a fellow lawyer, I'd love to look at your docs sometime.By the way, I'm 54.Are we of the same generation, by chance?