A more distant cousin was Sidney Colvin, who grew up to be a critic, curator, and great friend of Robert Louis Stevenson.

[1] Promoted captain on 31 December 1917, he served in the Admiralty as assistant director of plans and was appointed a Commander of the Order of the British Empire.

[1] After the war Colvin commanded the cruiser HMS Caradoc in the Black Sea and the Mediterranean and in 1922 to 1924 he was naval attaché in Tokyo.

[1] He re-joined HMS Revenge as flag captain to the Commander-in-Chief, Atlantic Fleet, and in 1927 became director of the Naval Tactical School, Portsmouth.

[1] Under his leadership, the Royal Australian Navy expanded its naval fleet and maintained a high profile in Australia's military affairs.