William Smith O'Brien

Parents

• Sir Edward O'Brien, 4th Baronet

Children

• Lucy Josephine O'Brien
• Lucius O'Brien

Siblings

• Henry O'Brien
• Robert O'Brien
• Anne O'Brien
• Harriet Monsell
• Edward O'Brien
• Grace O'Brien
• Catherine Lucia O'Brien
• Lucius O'Brien, 13th Baron Inchiquin