In his will, James Lord Duffus refers to “Captain John Sutherland, my natural son, adjutant to Lord…. Regiment of Irish Militia”.
Sources
The family tree of the Dukes, Earls, Lairds and Chiefs of Clan Sutherland 1100-2015 by John M Sutherland-Fisher, Genealogist of Clan Sutherland
The Peerage of Scotland by Sir Robert Douglas (1764) 1st edition within which are found:(Sutherland, Lord Duffus pages 194-196 and Sutherland Earl of Sutherland pages 660-667)
The History of the Earldom of Sutherland by Sir Robert Gordon (written 1650) who was younger son of Alexander Gordon 12th Earl of Sutherland and created 1st Baronet of Gordonstoun
The Sutherland Books Volumes 1-3 by Sir William Fraser (1892) [presented in 1894 by the Duke of Sutherland to Queen Victoria]
A short history of Clan Sutherland , the families of Sutherland, Forse and Duffus 12th -19th centuries by Daniel J J Sutherland, Historian Emeritus of Clan Sutherland. http://www.duffus.com/ashort.htm
A Fighting Clan: Officers in Clan Sutherland 1250-1850 by Malcolm Sutherland, Historian Emeritus of Clan Sutherland.
Private papers in the collection of James B Sutherland, Historian of Clan Sutherland
Private papers in the collection of John M Sutherland-Fisher, Genealogist of Clan Sutherland
Memorabilia Domestica by the Rev. Donald Sage, Minister of Resolis, Ross-shire (step-son of Jean Sutherland of Midgarty)
Caithness Family History by John Henderson first published in 1882
Notes
John may have been a "chip off the old block". He is known to have fathered at least one daughter but as a number of men of unknown Irish origins are showing the Sutherland yDNA, he may have fathered some sons during his time in Galway!
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: