I am not a member of this family, but I previously entered information on Cuthbert Bullitt from a book I own on Prince William Co., VA. I recently purchased another booklet from the musuem in Manassas "Journal of Historic Prince William," which includes an article on Cuthbert researched and written by Bob Wohlhueter. He has a piece of information which is different from yours - "Cuthbert Bullit was the son of Benjamin and Elizabeth (Harrison) Bullit. Benjamin was born in Maryland on April 28, 1693. He left his father, Joseph Bullitt, and the famiy home in a Fork of Mattioman (near Easton) and moved to Prince William County, Virginia. A January 20, 1723 entry in the Stafford County deed book shows Benjamin Bullitt as being indentured with wife, Sarah, and son, Joseph."
"Apparently something happened to his wife, Sarah, because in 1727, he married Elizabeth Harrison of the Chappawamsie family." This information has Joseph as the son of a first wife Sarah, and being born before 1723. Any descendants of Joseph will be interested in this.