"United States Census, 1910," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:ML81-944 : accessed 18 September 2020), Donald M Caulkins in household of Goodell B Caulkins, Gorham, Fulton, Ohio, United States; citing enumeration district (ED) ED 12, sheet 3A, family 64, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 1184; FHL microfilm 1,375,197.
Find a Grave, database and images (https://www.findagrave.com : accessed 18 September 2020), memorial page for Donald M Caulkins (1897–1980), Find a Grave Memorial no. 94107808, citing Midland City Cemetery, Midland, Midland County, Michigan, USA ; Maintained by Farison Roots (contributor 47254415) .
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DNA Connections
It may be possible to confirm family relationships with Donald 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: