Edward Dominic O'Brien High Sheriff of Clare (1735–1801) Parents Mary Jephson James O'Brien Children Lord Edward O'Brien James O'Brien, 3rd Marquess of Thomond John O'Brien William O'Brien, 2nd Marquess of Thomond Mary O'Brien Murrough O'Brien Harriet O'Brien Siblings Anne O'Brien Henrietta O'Brien Murrough O'Brien, 1st Marquess of Thomond Partners Mary Carrick