Alexander Duff was born 18 April 1731 to William Duff, 1st Earl of Fife (1697-1763) and Jean Grant (1705-1788) and died 17 April 1811 Banff, Banffshire, Scotland, United Kingdom (Duff House) of unspecified causes. He married Mary Skene (c1731-) 17 August 1775 in Carriston, Angus, Scotland, United Kingdom.
|Offspring of Alexander Duff and Mary Skene (c1731-)|
|James Duff, 4th Earl of Fife (1776-1857)|
|Alexander Duff (c1778-1851)||1778||21 March 1851 Walham Green, United Kingdom||Anne Stein (c1789-1859)|