Mabel Alice Smith-Marriott (died 1973) (d. 1973) Parents Sir William Henry Marriott Smith-Marriott, 5th Bt. Elizabeth Dorothy Cavendish Children Robert Henry Cooper Geoffrey Mervyn Cooper Arthur William Douglas Cooper Siblings Sir John Richard Wyldbore Smith-Marriott, 7th Bt. Dorothea Anna Smith-Marriott Sir William John Smith-Marriott, 6th Bt. Partners Arthur Hamilton Cooper