According to his gravestone in Caplinger Mills Cemetery, Caplinger Mills, Cedar County, Missouri (and supported by other records) William C Gilbert was born on 26 Jan 1881 and died on 12 Oct 1923.[1]
"United States World War I Draft Registration Cards, 1917-1918", database with images, FamilySearch (https://www.familysearch.org/ark:/61903/1:1:K3RC-VF2 : 24 December 2021), William Columbus Gilbert, 1917-1918.
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DNA Connections
It may be possible to confirm family relationships with William 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: