Marriage 1 Molly Browning b c 1670
Married: in Virginia
Children
-1 Marshall Duncan b: c 1690 in Scotland
-2 Robert R Duncan Du8 =9 b 1692/1710 in Scotland d 1793 m Ann Gallop b 1715 ancestry.com shows his mother as Dorcas Butler and John and Elizabeth ans children of Molly Browning

Marriage 2 Doras Butler in Virginia
Children
Joseph Duncan b in Orange Co Va (possibly the same Joseph Duncan b about 1712 m Lydia Hooe b about 1724 dau of Howson HOOE b ABT 1696 in St Pauls,King George,Va. and Anne Frances HARRIS b c 1703 )

The latter had 7 ch:

-3 Jemima DUNCAN b ABT 1748 in Fauquier,Va m John MAUZY b c 1745 in Fauquier Va son of Henry MAUZY b 1721 in ,Stafford, Va. and Ann WITHERS b 20 Jun 1721 in Stafford Va.
-3-1 Nancy Polly MAUZY b c 1773 m Edwin PORTER b: ABT 1773
-3-1-1 Sarah PORTER b c 1800
-4 Hannah DUNCAN b c 1750 in Fauquier,Va m Ebeneezer PORTER b ABT 1753.
-5 Howsen Hooe DUNCAN b 21 Sep 1757 in Fauquier,Va m Agnes JOHNSON b 14 Aug 1762 in Fauquier,Va dau of Samuel Johnson
-5-1 Joseph DUNCAN b 27 Jul 1781 in Fauquier Va..
-6 Lydia Elizabeth DUNCAN b ABT 1741 in Fauquier Va m1 Thomas STAMPS b ABT 1728 in Lancaster Va. m2 John O'BANNON Ba8-1-3 b ABT 1735 in Fauquier Va.
-6-1 Joseph O'Bannon b 14 Dec 1759 in Fauquier d there about 1822 m Eizbeth Bullitt + ch
-7 Mary DUNCAN b ABT 1744 in Fauquier Va m 8 Dec 1763 in Fauquier James WRIGHT b ABT 1738 in Prince William,Va son of .
-7-1 Elizabeth WRIGHT b Feb 1762 in Lancaster Va m 27 Jun 1785 in Fauquier Va John Thomas JAMES b: ABT 1746 in Fauquier
-7-1-1 Mary Polly JAMES b: ABT 1791 in Fauquier,Va.
-7-1-2 David JAMES b: 1 Jul 1792 in Fauquier Va.
-7-1-3 Tarlton Aldridge JAMES b c 1794 in Warrenton, Fauquier, Va.
-7-1-4 Margaret Wright JAMES b 2 Sep 1796 in Fauquier, Va.
-7-1-5 Elizabeth JAMES b c 1790
-8 Rosamond DUNCAN b c 1745 in Fauquier Va d 1796 m John Withers Wi7-3 no know ch he m2 6 Sep 1796 Susannah Rosser
-9 Joseph DUNCAN b c 1746 in Fauquier Va m Catherine O'BANNON b ABT 1748 in Fauquier.