Douglas-Home lair ing Mayfair, London, minangka anak kapisan saka pitung anak saka Lord Dunglass (anak mbarep saka The 12th Earl of Home) lan garwane, Lady Lilian Lambton (putri saka The 4th Earl of Durham). Jeneng pisanan bocah lanang kasebut biasane disingkat dadi "Alec".
Mayfair, London