Doyle, I, too, have a female child of William Duncan b. abt 1766 and married to Nancy. I do not have any other information down line. I do have William's ancestors back to James Duncan born abt. 1630 in Scotland and Issobell Niddrie born Feb. 12, 1631/32 in Edinburgh, Scotland if you do not have them. Email me directly. Would like to talk about William's brother, Robert. Sorry I do not have information on the female child. Good luck. A. Deason Smith in SC Researching SMITH, KENNEDY, ELROD, DEASON, McGILL, LUSK, VAUGHN, HUGHES, MOORE, EVANS, RAY, COOPER, HUFFMAN, POSEY, ADAIR