The eldest of the five children of the medical practitioner Guy Dixon Menzies (1873–1947),Deaths: Menzies The Sydney Morning Herald, Tuesday, 1 April 1947, p. 22. and Ida Mabel Menzies , née Lambton (1881–1975),Marriages: Menzies—Lambton The Sydney Morning Herald, Saturday, 28 November 1908, p. 12.Deaths; Menzies The Sydney Morning Herald, Thursday, 8 May 1975, p. 30. Guy Lambton Menzies was born at Drummoyne, New South Wales on 20 August 1909.Births: Menzies The Sydney Morning Herald, Saturday, 4 September 1909, p. 12.
