Agatha Christie's sister Magaret 'Madge' Frary Miller by William Logsdail, William Logsdail, 1928
Magaret 'madge' frary miller (1879–1950), mrs james watts (detail). Date: 1928. Dimensions: height: 139.5 cm (54.9 in); width: 78.5 cm (30.9 in). Medium: oil on canvas. Collection: National Trust.