Question: Who is Archduke Stefan Of Austria's paternal grandfather?
Sentence (from "Archduke Otto of Austria (1865–1906)"): Archduke Otto Franz Joseph Karl Ludwig Maria of Austria (21 April 1865 – 1 November 1906) was the second son of Archduke Karl Ludwig of Austria (younger brother of Emperor Franz Joseph I of Austria) and his second wife, Princess Maria Annunciata of Bourbon-Two Sicilies.
Relevant evidence: No