"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJQB-6DF : accessed 21 August 2017), Robert Calkins in household of Elizabeth Calkins, Chicago Ward 25, Cook (Chicago), Illinois, United States; citing ED 1393, sheet 5B, line 64, family 118, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 341; FHL microfilm 1,820,341.
"United States World War II Army Enlistment Records, 1938-1946," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KMFK-VZG : 5 December 2014), Robert E Calkins, enlisted 16 Apr 1941, Chicago, Illinois, United States; citing "Electronic Army Serial Number Merged File, ca. 1938-1946," database, The National Archives: Access to Archival Databases (AAD) (http://aad.archives.gov : National Archives and Records Administration, 2002); NARA NAID 126323, National Archives at College Park, Maryland.
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DNA Connections
It may be possible to confirm family relationships with Robert 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: