William O'Brien, 4th Earl of Inchiquin

British earl and politician (1700–1777)

Parents

• William O'Brien, 3rd Earl of Inchiquin
• Mary Villiers

Children

• Mary O'Brien, 3rd Countess of Orkney
• William O'Brien
• Murrough O'Brien
• George O'Brien
• Augustus O'Brien

Siblings

• Lady Henrietta O'Brien
• Charles O'Brien
• Lady Mary O'Brien
• James O'Brien

Partners

• Mary Moore
• Anne O'Brien, 2nd Countess of Orkney