Mary married Alexander Duff, 3rd Earl of Five on 17 Aug 1775 in Angus, Scotland. Alexander (son of Lord William Duff, of Braco, 1st Earl of Fife and Jean Grant) was born on 18 Apr 1731 in Scotland; died on 17 Apr 1811 in Banff, Scotland. [Group Sheet] [Family Chart]

1. James Duff, 4th Earl of Five was born on 6 Oct 1776 in Turriff, Aberdeenshire, Scotland; died on 9 Mar 1857 in Banff, Scotland.
2. Gen. Hon. Col. Alexander Duff was born on 4 Oct 1777 in Logierait, Scotland; was christened on 14 Oct 1777 in Echt, Aberdeenshire, Scotland; died on 21 Mar 1851 in Walham Green, England; was buried in Mar 1851 in Banffshire, Scotland.
3. Hon. Lady Jean Duff was born on 9 Aug 1780 in Echt, Aberdeenshire, Scotland; died on 22 May 1850 in Edinburgh, Scotland.