 In 1950, Carr married Sara Ann Mary Strickland, daughter of Algernon Walter Strickland and of Lady Mary Pamela Madeline Sibell Charteris.Sara Strickland's maternal grandfather was Hugo Charteris, 11th Earl of Wemyss, and one of her great-grandfathers was Percy Wyndham (1835–1911), a Conservative politician who was one of The Souls.The Carrs have three sons and one daughter, Adam Henry Maillard Carr (born 1951), Matthew Xavier Maillard Carr (1953-2011), Laura Selina Madeline Carr (born 1954), and Alexander Rallion Charles Carr (born 1958).