Margaret Wemyss, 3rd Countess of Wemyss, was born 1 January 1659 to David Wemyss, 2nd Earl of Wemyss (1610-1679) and Margaret Leslie (1621-1688) and died 11 March 1705 of unspecified causes. She married James Wemyss, Lord Burntisland (c1655-1682) 28 March 1672 . She married George Mackenzie, 1st Earl of Cromarty (1630-1714) 29 April 1700 .
|Anne Wemyss (1675-1702)||28 October 1675 Wemyss, Fife, Scotland, United Kingdom||9 January 1702 Edinburgh Castle, Edinburgh, Midlothian, Scotland, United Kingdom||David Leslie, 5th Earl of Leven (1660-1728)|
|Margaret Wemyss (c1677-1763)|
|David Wemyss, 4th Earl of Wemyss (c1678-1720)|
|John Wemyss (c1680-)|
|Cathren Wemyss (c1682-)|