^Social Security Death Index (Death Master File), Blanche Hackett, 18 June 1896 – September 1986.
^U.S. Census, April 15, 1910, State of California, County of Alameda, City of Berkeley, enumeration district 47, page 8A, family 157, Sarah B. Sweet, age 13 years.
^U.S. Census, January 1, 1920, State of California, County of Los Angeles, City of Los Angeles, enumeration district 63, page 6A, family 159, Blanche Sweet, age 23 years.