Douglas-Home an haife shi ne a Mayfair, London, na farko daga cikin 'ya'ya bakwai na Ubangiji Dunglass (ɗan fari na 12th Earl of Home) da matarsa, Lady Lilian Lambton (yar The 4th Earl of Durham). Sunan farko na yaro an rage shi zuwa "Alec". Daga cikin' ya'yan ma'aurata sun kasance mai wasan kwaikwayo William Douglas-Home.A cikin 1918 na 12th Earl of Home ya mutu, Dunglass ya yi nasara da shi a cikin earldom, kuma sunan ladabi ya wuce zuwa Alec Douglas-Home, wanda aka yi wa lakabi da Lord Dunglass har zuwa 1951.
Mayfair, Landan