The Doster Genealogy, Mrs. Ben Hill Doster, 1945, mentions a daughter of James Doster, d. 1818 Mecklenburg Co, NC, on pages 70, 83. It simply says a "Girl Doster, b. about 1790 Buford Twp., Union County, N.C. m. Everett. Went West." It is likely this is Sarah, who was born ca 1778. Her son, Joseph, married in Jackson Co, GA, in 1817, Rebecca Doster, the daughter of William and Elizabeth Doster. We think this William was a nephew of James, and first cousin of Sarah, so 2nd cousins married, assuming all this is correct!