Burial:
Mount Olivet Cemetery
Hannibal
Marion County
Missouri, USA [1]
Tombstone has 1957 date which is definitely a mistake based on the 1940 census showing his wife as a widow.
Census
1920 - living in Alton, Madison Co, IL with wife and 3 children
1930 - wife and 2 children in Jacksonville, IL - he is not shown but wife's marital status is married
Sources
↑ Find A Grave, database and images (https://www.findagrave.com : accessed 16 February 2020), memorial page for John E. Chappell (1875–1957), Find A Grave: Memorial #153995339, citing Mount Olivet Cemetery, Hannibal, Marion County, Missouri, USA ; Maintained by Susan White (contributor 46913658) .
"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:K6D5-JRS : accessed 7 November 2015), John Elmer Chappell, 1917-1918; citing Madison County no 2, Illinois, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,614,326.
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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 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 John: