[1] He also served as the Quebec agent to the London firm of Sir Samuel Fludyer, Adam Drummond (his brother) & Franks, contractors for victualling the troops in North America.
At Quebec, Drummond became a business partner of Jacob Jordan and John Halstead, in the wheat trade and biscuit baking from 1767 to 1769.
[9] Through his son Adam, he was posthumously a grandfather of John Murray Drummond, 8th of Megginch (1803–1889), a captain in the Grenadier Guards who was Justice of the Peace and Deputy Lieutenant of Perthshire;[c] Rev.
Charlotte Olivia Strutt, a daughter of Lady Charlotte Mary Gertrude FitzGerald, suo jure 1st Baroness Rayleigh; Adam Augustus Drummond (c. 1806–1874), who married Sandelia Simon; Charles Drummond (d. 1831), who died in India; and Col. Henry Maurice Drummond-Hay (1814–1896),[5] a well known naturalist and ornithologist.
[10] Through his youngest son Gordon, he was posthumously a grandfather of Elizabeth Drummond (c. 1811–1894), who married Henry Howard, 2nd Earl of Effingham.