Here's another article of interest from the Journal of Genetic Genealogy (Fall 2023). Dennis John O'Brien published an article titled "Our Study: The O'Brien Irish Royal Line, R-DC782, the 'Y' Male Line of Descendants" [full article, PDF]. I wonder if my John O'Brien is connected to this same line. One of my current research questions is to see how the Pennsylvania O'Briens are linked to John. It would be great to find out if our O'Briens share the same Y-DNA haplogroup.
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