Question: Who is Archduke Stefan Of Austria's paternal grandfather?
Sentence (from "Archduke Anton of Austria"): Archduke Anton of Austria (Anton Maria Franz Leopold Blanka Karl Joseph Ignaz Raphael Michael Margareta Nicetas von Habsburg-Lorraine; Vienna, 20 March 1901 – Salzburg, 22 October 1987) was an Archduke of Austria and Prince of Tuscany.
Relevant evidence: No