After the death of the 6th Earl of Dunraven, the title is inherited by his only son, Thady Windham Thomas Wyndham Quin. He married Geraldine McAleer in 1969 and they have one daughter, Lady Ana. He devoted his life to the running of the Estates and campaigning for the disabled in Ireland; Thady had contracted poliomyelitis as an adolescent and was a wheelchair user for the rest of his life. He held the honour of Patron of the Irish Wheelchair Association for twenty years. With no male heir, the Earldom and his other titles became extinct on his death in March 2011.