Question: Who is the maternal grandfather of Archduchess Maria Theresa Of Austria (1862–1933)?
Answer: Ferdinand II of the Two Sicilies

Maria Theresia was the eldest child and eldest daughter of Archduke Karl Salvator of Austria and his wife, Princess Maria Immaculata of Bourbon-Two Sicilies. Princess Maria Immaculata of Bourbon-Two Sicilies (Full Italian name: "Maria Immacolata Clementina, Principessa di Borbone delle Due Sicilie") (14 April 1844, Naples, Kingdom of the Two Sicilies – 18 February 1899, Vienna, Austria) was fifth child and second-eldest daughter of Ferdinand II of the Two Sicilies and his wife Maria Theresa of A