Mary O'Brien

Parents

• Edward Dominic O'Brien
• Mary Carrick

Children

Siblings

• James O'Brien, 3rd Marquess of Thomond
• Murrough O'Brien
• John O'Brien
• Lord Edward O'Brien
• Harriet O'Brien
• William O'Brien, 2nd Marquess of Thomond

Partners

• Sir Richard Eyre Cox, 4th Baronet