For what it's worth, I have Robert McKee, Jr. b. 1767, d. 30 Oct 1830, m. Jane Cather 5 Sep 1793, dau of Jasper and Barbara (Lawrence) Cather. Jane was b. 12 Nov 1773, d. 3 Aug 1853.
I have nothing else except Willa Cather's childhood home, Willow Shade, is still standing, a couple of miles east of Gore, VA, and just east of Back Creek, aloongside US 50.
There's a roadside marker: WILLOW SHADE --This house, built in 1858, was the childhood home of novelist Willa Cather from 1874 to 1883, when she moved with her family to Nebraska. It was the setting of the final chapters of her novel SAPPHIRA AND THE SLAVE GIRL. Willa Cather was born December 7, 1873, one mile south in the community, then known as Back Creek Valley.