 His great-grandmother, born Julia Prinsep Jackson, was a niece of Julia Margaret Cameron, the photographer, while his great-grandfather, Herbert Duckworth, was a barrister.After her husband's death, Duckworth-Chad's great-grandmother Julia married secondly the author Leslie Stephen.Duckworth-Chad's paternal grandmother, Lady Margaret Herbert, was a daughter of the 4th Earl of Carnarvon, making him a cousin of Auberon Waugh.