Though I am not of Boylston or Willis descent, I have connections with the Willis family of Williston, SC through my Johnston, Head, & Merritt lines, so I thought this information could be useful to others.
This information was compiled by Elizabeth Willis DeHuff prior to 1965. I have not verified any of this infomation.
Sarah Willis, daughter of Robert Willis and Keziah Boylston, married George Boylston (Boyleston, Boilstone, Boilston). Sarah was born about 1796 (1804 hand written above this.)
Their children were: 1) Robert Belton Boylston m. Winnifred Porter (part of this info. from LDS website) 2) Judson 3) Martha m. John Mixon 4) Antoinette m. Gus Weeks 5) Joanna m. James Fanning, her 1st cousin, son of James Patrick Fanning & Ellen Willis.
Sarah Willis Boylston had a brother, Elijah Willis, who never married. In his will at Barnwell County Courthouse, Book D, Vol. 2, Page 270, (1826-1856), George Boylston & Sarah, his wife, received part of the estate of Elijah Willis.
I believe that George may be the son of George Boylston & Alice Cloud.