Question: When did Archduke Stefan Of Austria's mother die?
Sentence (from "Archduke Stefan of Austria"): Archduke Stefan of Austria, Prince of Tuscany  (15 August 1932 in Mödling, Lower Austria, Austria – 12 November 1998 in Brighton, Michigan, United States) was a member of the House of Habsburg an Archduke and Prince of Tuscany by birth.
Relevant evidence: No