Sellar was the son of Patrick Sellar of Westfield, Morayshire and his wife Ann Craig of Barmakelty, Moray.
David Greenhill Bruce-Gardyne was a cousin of Sir John Alexander Macdonald, GCB, KCMG, PC, PC (Can) first Prime Minister of Canada, and his wife Azemia Sellar was a granddaughter of the notorious Patrick Sellar.
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