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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Athey-139 and Athy-32 appear to represent the same person because: same person, please merge. The last name was spelled ATHY in Ireland (and for some in the U.S. as well) so Athey-139 needs to merge into Athy-2.