Source: Davidson, John, Rev., Inverurie and The Earldom of the Garioch: A Topographical and Historical Account of the Garioch from Earliest times to the Revolution Settlement; A. Brown & Co., Aberdeen 1878. Page 437
The Marischal's second son, Sir Robert, also preceased him, but during his brother's lifetime he had married the heiress of Troup, and had two sons- Sir William the next Marischal, and John who got Troup-and whose descendant George Keith of Northfield, was 24th September 1742, served heir male of Sir Robert Keith, great Marishchal of Scotland. One daughter Margaret, married Hugh Arbuthnott of Arbuthnott; another, Elizabeth, married Alexander Irvine of Drum.
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