"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XQBQ-BNY : accessed 25 August 2017), Ralph Calkins in household of William Calkins, Isabella, Isabella, Michigan, United States; citing enumeration district (ED) ED 11, sheet 4A, line 20, family 64, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 995; FHL microfilm 2,340,730.
"Michigan Death Certificates, 1921-1952," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:KF37-BZZ : 12 December 2014), Ralph Harold Calkins, 06 Jul 1934; citing Isabella, Isabella, Michigan, United States, Division for Vital Records and Health Statistics, Lansing; FHL microfilm 1,972,757.
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DNA Connections
It may be possible to confirm family relationships with Ralph 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: