"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MDP1-3XY : accessed 3 July 2017), Robert Calkins in household of Roland F Calkins, Cleveland Ward 6, Cuyahoga, Ohio, United States; citing ED 104, sheet 7B, line 80, family 159, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1362; FHL microfilm 1,821,362.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:X43Q-N8L : accessed 3 July 2017), Robert F Calkins in household of Rollen F Calkins, Cleveland (Districts 1-250), Cuyahoga, Ohio, United States; citing enumeration district (ED) ED 127, sheet 10B, line 83, family 21, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1766; FHL microfilm 2,341,500.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KW5W-YTT : accessed 3 July 2017), Robert Calkins in household of Rolland Calkins, Ward 9, Cleveland City, Cleveland City, Cuyahoga, Ohio, United States; citing enumeration district (ED) 92-238, sheet 4B, line 67, family 77, 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 3212.
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DNA Connections
It may be possible to confirm family relationships with Bob by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: