When Marjorie Mondell was born on 3 January 1906, in Washington, District of Columbia, United States, her father, Frank W Mondell, was 45 and her mother, Ida Harris, was 26. She married Alfonso Beaumont Landa Jr on 26 June 1930, in Washington, District of Columbia, United States. She lived in Newcastle, Weston, Wyoming, United States in 1910. She died on 25 April 1968, in Washington, District of Columbia, United States, at the age of 62.