"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZS6-267 : accessed 10 August 2017), Max E Calkins in household of Marc D Calkins, Coldwater Ward 1, Branch, Michigan, United States; citing ED 10, sheet 6B, line 38, family 158, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 758; FHL microfilm 1,820,758.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K42N-LPN : accessed 10 August 2017), Max E Calkins, Battle Creek, Battle Creek City, Calhoun, Michigan, United States; citing enumeration district (ED) 13-28A, sheet 61A, line 32, family 140, 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 1736.
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DNA Connections
It may be possible to confirm family relationships with Max by comparing test results with other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: