Hi. Wonderfull information shared here! Here's a litle more for you. David Duncan O'Barr had a brother named "Jessi". Jessi had a son named "Agustas Barto O'Barr"(died in Arizona). Agustas Barto had a son named Banjamin Arthur O'Barr. Benjamin Arthur had a son named Joseph Arthur O'Barr. Joeseph Arthur has a son named Brian Arthur O'Barr(me). And Yes, David Duncans father was Thomas O'Barr.The father of Thomas was Michael O'Barr jr. who was the son of Michael O'Barr sr.Michael O'Barr sr. came from Inishowen, Donegal Ireland.