"United States Census, 1910," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:M2YJ-LH6 : accessed 14 February 2021), Calvin Shackelford in household of Vincent Shackelford, Washington Township, Jackson, Missouri, United States; citing enumeration district (ED) ED 218, sheet 2B, family 37, NARA microfilm publication T624 (Washington D.C.: National Archives and Records Administration, 1982), roll 789; FHL microfilm 1,374,802.
"California Death Index, 1940-1997," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:VP22-4L5 : 26 November 2014), Calvin M Shackelford, 24 Feb 1975; Department of Public Health Services, Sacramento.
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DNA Connections
It may be possible to confirm family relationships with Calvin by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Calvin: