Mary was born in 1912. She was a daughter of Fred Alfred Theobald and Lucy Jameson.
"Iowa, Delayed Birth Records, 1850-1939," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q246-57DZ : accessed 2 September 2020), Mary Louise Theobald, 17 May 1912, Iowa Township, Iowa, Iowa, United States; citing reference ID 344144, State Historical Society of Iowa, Des Moines; FamilySearch digital folder 101715036.
"United States Census, 1920", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:MHNN-X77 : 4 January 2021), Mary L Theobald in entry for Fred Theobald, 1920.
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