"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M84G-RCG : accessed 9 July 2017), Courtlund Allen in household of Court P Allen, Trenton Ward 4, Grundy, Missouri, United States; citing ED 62, sheet 3A, line 3, family 57, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 916; FHL microfilm 1,820,916.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XHX1-MGG : accessed 9 July 2017), Courtlandt Allen in household of Alida E Allen, Trenton, Grundy, Missouri, United States; citing enumeration district (ED) ED 15, sheet 1A, line 12, family 5, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1190; FHL microfilm 2,340,925.
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DNA Connections
It may be possible to confirm family relationships with Courtland 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 Courtland: