Thanks for posting such a HUGE amount of info. It was very helpful to me. I wanted to fill in a couple of blanks for you on my ancestor: Elizabeth Cammack Holloway (daughter of William Elizabeth married George Holloway, b. abt 1735 in Caroline Co., VA and d. 1771.
COLONIAL COUSINS by Garland Hopkins, 1940: (p.18) V.(3) George Holloway, son of John Holloway, married Elizabeth Cammack, said to have been his first cousin, evidently on the maternal side. There is a paper prepared by Mrs. Virginia Farish, daughter of Robert Green Holloway, Sr., which states that George Holloway and Elizabeth Cammack were her great-grandparents. McIlhany in his "Some Virginia Families" gives George and Betsy Holloway of Caroline County as parents of Thomas Slaughter Holloway and George Holloway, Jr. Henry Holloway of Amherst County, names these two and others as brothers and sisters in his will.
Their daughter Eliza Holloway (b. abt 1800, d. aft 1880) married 8 Aug 1821 in Caroline, VA to John T. Bullock (b. abt 1794 VA, d. 1871-1880).
I have more on the descendents, if you're interested ... Eliza and John Bullock's daughter Ann Eliza married Charles W. Brewer. Their son Charles Baiham Brewer married Marian M. Hewitt. Their son Graham Hewitt Brewer (b. 1888) was my g-grandfather.