John married Agnes LYLLE on 30 Apr 1737 in Strathblane, Stirlingshire, Scotland. Agnes (daughter of Charles LYLLE and Bethia HARVEY) was christened on 11 Jun 1717 in Strathblane, Stirlingshire, Scotland; died on 30 Apr 1737 in Strathblane, Stirlingshire, Scotland. [Group Sheet] [Family Chart]

1. John DUNCAN was christened on 2 Mar 1738 in Strathblane, Stirlingshire, Scotland; and died.
2. Charles DUNCAN was christened on 29 May 1739 in Strathblane, Stirlingshire, Scotland; and died.
3. Bethia DUNCAN was christened on 17 Nov 1741 in Strathblane, Stirlingshire, Scotland; and died.