Other than he was alive and living in Courtland, KS as of May of 1991, I have yet to find any additional information for John (May 2014)
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Sources
Only the Trusted List can access the following:
John's formal name
full middle name (C.)
exact birthdate
birth location
exact deathdate
images (2)
private siblings' names
private children's names (4)
spouse's name and marriage information
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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: