From the book "Hopewell Friends History, 1734-1934, Frederick County, Virginia" is the following:
"Thomas Fawcett, son of Richard and Rachel Fawcett of Frederick County in the Colony of Virginia, and Martha Branson, daughter of John and Martha Branson of the County aforesaid; 11th day of the 1st month, 1769; at Crooked Run." (I did not see Crooked Run on the small map in the book, but there is a Fawcett's Gap near Mt. Pleasant, south west of Winchester.)
There were about 41 people listed as witnesses, among whom were the following Bransons - Eliz., William, Lionel, Rebecca, Abraham, John, and Martha.The followin were Fawcetts - John, Mary, Richard, Rachel, Joseph, and another Joseph.
I am not researching these people, and have no further information.