Margaret was born in 1900. She passed away in 1969.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHVL-H8Q : accessed 16 August 2019), Margaret M Mann in household of Gordon F Mann, Jamesport, Daviess, Missouri, United States; citing enumeration district (ED) ED 11, sheet 2A, line 19, family 30, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1185; FHL microfilm 2,340,920.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KW11-WR9 : 28 July 2019), Margaret Manns in household of Gordon Manns, Ward 37, Chicago, Chicago City, Cook, Illinois, United States; citing enumeration district (ED) 103-2314, sheet 3B, line 75, family 69, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 995.
Find A Grave, database and images (https://www.findagrave.com : accessed 16 August 2019), memorial page for Margaret Yates Mann (7 Jan 1900–7 Feb 1969), Find A Grave: Memorial #76807775, citing Jamesport Masonic Cemetery, Jamesport, Daviess County, Missouri, USA ; Maintained by Lanita Sconce Smith (contributor 46834015) .