He was the younger brother of the aeronautical engineer David J. Farrar - references to David appear throughout his published writings - and first cousin of Stewart Farrar.
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Born in London, England in 1921, Farrar was the elder son of Donald Frederic Farrar (1897–1982), a former Royal Flying Corps supply pilot, and Mabel Margaret Farrar, née Hadgraft (1896–1985), and brother of RAF airman and poet James Farrar.