| Children |
| | 1. Charles Duncan, b. 6 Aug 1687, Perth, Perthshire, Scotland  d. 1780, Culpepper, Virginia, United States (Age 92 years) |
| | 2. Elizabeth Duncan, b. 1683, Perthshire, Scotland d. 17 Oct 1739, Richmond, Henrico, Virginia, British Colonial America (Age 56 years) |
| | 3. Edmund Duncan, b. 1 Jun 1684, Bucks, Pennsylvania, British Colonial America d. 8 Oct 1760, Bensalem Township, Bucks, Pennsylvania, British Colonial America (Age 76 years) |
| | 4. Barbara Duncan, b. 1684, Perth, Perthshire, Scotland d. 1707, Richmond County, Virginia, British Colonial America (Age 23 years) |
| | 5. Susan Duncan, b. 1684, Perthshire, Scotland |
| | 6. Henry Duncan, b. 26 Jul 1685, Perthshire, Scotland |
| | 7. Thomas Duncan, b. 12 Jan 1686, Perth, Perthshire, Scotland d. 9 Jul 1776, Carlisle, Cumberland, Pennsylvania, United States (Age 90 years) |
| | 8. Robert Duncan, b. 1686, Kincardineshire, Scotland |
| | 9. John Duncan, b. 14 Feb 1689, Longforgan, Perth And Kinross, Scotland, United Kingdom d. 1793, Pennsylvania, United States (Age 103 years) |
| | 10. Margaret Duncan, c. 22 Jan 1691, Longforgan, Perthshire, Scotland d. Bef 1722, British Colonial America (Age ~ 30 years) |
| | 11. William Duncan, III, b. 1691, Perth, Perthshire, Scotland d. 1781, Bromfield Parish, Culpeper, Virginia, United States (Age 90 years) |
| | 12. Raleigh Duncan, b. Between 1682 and 1700, Cullpepper County Virginia, British Colonial America d. 21 Oct 1793, Culpeper, Culpeper, Virginia, United States (Age 111 years) |
| | 13. Townsend Duncan, b. 20 Dec 1691, Perth, Perth, Scotland, Great Britain d. 1722 (Age 30 years) |
| | 14. Robert Duncan, b. Jun 1692, Perth, Perthshire, Scotland d. 21 Oct 1793, St. Mark's Parish, Culpeper, Virginia, United States (Age 101 years) |
| | 15. George Duncan, b. 1692, Abercorn, Linlithgowshire, Scotland |
| | 16. Helen Duncan, b. Abt 1695, Aberdeenshire, Scotland |
| | 17. Susan Duncan, b. 1696, Perth, Perthshire, Scotland d. 17 Dec 1754, Louisa, Virginia, United States (Age 58 years) |
| | 18. Alexander Duncan, b. 1696, ,, Virginia |
| | 19. John Duncan, b. 1700, Dumfries, Dumfriesshire, Scotland d. 23 Jan 1746, Albermarie, Virgina. USA (Age 46 years) |
| | 20. Marshall Robert Duncan, b. 1705, Westmoreland, Virginia, United States d. 21 Oct 1793, Culpepper, Virginia, United States (Age 88 years) |
| | 21. Marshall "the Elder" Robert Duncan, b. 1710, Virginia, British Colonial America d. May 1777, Surry, North Carolina, United States (Age 67 years) |
|
1659 - 1720 (61 years)