Mary Ford was born Iris Colleen Summers in El Monte, California, the second daughter of Marshall McKinley Summers (born February 13, 1896, in Ridgway, Illinois; died August 5, 1981, in Los Angeles), a Nazarene minister, who later became a painting contractor, and his wife, Dorothy May White Summers (born April 5, 1897, in Missouri; died February 22, 1988, in South El Monte, California), and was the sister of Byron Fletcher Summers, Esther E. Williams, Carol Jean Corona, Bruce Summers, Eva Wootten and Bob Summers.