Ruvigny et Raineval, Melville Henry Massue, marquis de, The Jacobite Peerage, Baronetage, Knightage, and Grants of Honour, Extracted, by Permission, from the Stuart Papers Now in Possession of His Majesty the King at Windsor Castle, and Supplemented by Biographical and Genealogical Notes Edinburgh : T. C. & E. C. Jack https://archive.org/stream/jacobitepeerageb00ruvi#page/94/mode/2up
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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.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree:
Richard McKain :
AncestryDNA Paternal Lineage (discontinued) 46 markers, haplogroup R1b, Ancestry member mckainmckean