He never married. He lived with his two younger siblings throughout life, moving around wishing Clinton County, Illinois, supporting themselves through farming.
"Illinois Deaths and Stillbirths, 1916-1947," , FamilySearch (https://familysearch.org/ark:/61903/1:1:NQL7-HSX : 9 March 2018), John Wm Brueggemann, 29 Jan 1942; Public Board of Health, Archives, Springfield; FHL microfilm 1,851,353.
Find a Grave, database and images (https://www.findagrave.com/memorial/136556882/john-william-bruggemann: accessed 9 December 2023), memorial page for John William Bruggemann (8 Aug 1869–29 Jan 1942), Find a Grave Memorial ID 136556882, citing Saint Marys Cemetery, Carlyle, Clinton County, Illinois, USA; Maintained by P Jones (contributor 47471462).
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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: