"United States Census, 1940," database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:KM9X-C7B : 5 January 2021), John W Gilbert, Cannon Ball Township, Hettinger, North Dakota, United States; citing enumeration district (ED) 21-8, sheet 5A, line 17, family 23, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3004.
Death: "U.S., Social Security Death Index, 1935-2014" Social Security Administration; Washington D.C., USA; Social Security Death Index, Master File Ancestry Record 3693 #22162946 (accessed 9 April 2022) John Gilbert death Oct 1978.
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his ancestors' Y-chromosome or 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 John: