Paternal relationship is confirmed through Y-chromosome DNA testing. Kenneth Johnson FTDNA kit #202680, and his second cousin, FTDNA kit #177420, match at a Genetic Distance of 2 on 67 markers thereby confirming their direct paternal lines back to their MRCA Håkan August Johnson, the great grandfather of each. FTDNA indicates that the probability the two share a common ancestor within the last 3 generations is 31.83%.
Sources
Only the Trusted List can access the following:
David's formal name
full middle name (M.)
e-mail address
exact birthdate
images (1)
private siblings' names
spouse's name and marriage information
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DNA Connections
It may be possible to confirm family relationships by comparing test results with David or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
David Johnson:
Family Tree DNA Y-DNA Test 67 markers, haplogroup I-M253, FTDNA kit #177420