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Son of Col. William O'Brien, 7th Baron Inchiquin, 2nd Baron O'Brien & 2nd Earl of Inchiquin and Lady Margaret Boyle, Countess of Inchiquin Brother of Col. William O'Brien, 8th Baron Inchiquin, 3rd Baron O'Brien & 3rd Earl of Inchiquin and Col. James O'Brien, Commander of Portroyal