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It may be possible to confirm family relationships by comparing test results with Jonathan or other carriers of his ancestors' Y-chromosome or mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Family Tree DNA Y-DNA Test 37 markers, haplogroup R-M269, FTDNA kit #971767
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Jonathan:
AncestryDNA, GEDmatch ML5667381[compare], Ancestry member jw_hookedonbooks