Wyndham's mother, Iris Bennett, was an ex-débutante, and her father, Guy Richard Charles ("Dick") Wyndham (1896–1948), son of Guy Percy Wyndham, was an aristocrat whose ancestors included Lord Edward FitzGerald, the 18th-century Irish revolutionary.
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Col. John Giffard (1602–1665), grandson of John Giffard (d.1622), was a Colonel of Royalist forces in the Civil War, who married in 1621 Joan Wyndham, daughter of Sir John Wyndham (1558–1645) of Orchard Wyndham, near Williton, Somerset.
The Fortunate Fool is a 1933 British comedy film directed by Norman Walker and starring Hugh Wakefield, Joan Wyndham and Jack Raine.