Question: Who is Archduchess Rosa Of Austria's mother-in-law?

Knowledge 1: Archduchess Rosa of Austria
Archduchess "Rosa" Maria Antonie Roberta Josepha Anna Walburga Carmela Ignazia Rita de Cascia of Austria, full German name: "Rosa Maria Antonie Roberta Josepha AnnaWalburga Carmela Ignazia Rita de Cascia, Erzherzogin von Österreich" (22 September 1906, , Salzburg, Salzburg, Austria–Hungary – 17 September 1983, Friedrichshafen, Baden-Württemberg, Germany) was a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth.Through her marriage to Philipp Albrecht, Duke of Württemberg, Rosa was also a member of the House of Württemberg and Duchess consort of Württemberg. [SEP] Knowledge 2: Philipp Albrecht, Duke of Württemberg
Philipp Albrecht, Duke of Württemberg("George Philipp AlbrechtCarl Maria Joseph Ludwig HubertusStanislaus Leopold Herzog von Württemberg", 14 November 1893 – 17 April 1975) was the son of Albrecht, Duke of Württemberg, and Archduchess Margarete Sophie of Austria.He was born in Stuttgart, and became head of the formerly reigning royal House of Württemberg on the death of his father in 1939.He died in Ravensburg, aged 81.
Knowledge 1: Archduchess Rosa of Austria
Archduchess "Rosa" Maria Antonie Roberta Josepha Anna Walburga Carmela Ignazia Rita de Cascia of Austria, full German name: "Rosa Maria Antonie Roberta Josepha AnnaWalburga Carmela Ignazia Rita de Cascia, Erzherzogin von Österreich" (22 September 1906, , Salzburg, Salzburg, Austria–Hungary – 17 September 1983, Friedrichshafen, Baden-Württemberg, Germany) was a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth.Through her marriage to Philipp Albrecht, Duke of Württemberg, Rosa was also a member of the House of Württemberg and Duchess consort of Württemberg. [SEP] Knowledge 2: Archduchess Maria Carolina of Austria (1740–1741)
Archduchess Maria Carolina of Austria (Maria Carolina Ernestina Antonia Johanna Josefa; 12 January 1740 – 25 January 1741), was the third child and daughter of Archduchess Maria Theresa of Austria, later Holy Roman Empress and Duke Francis of Lorraine.
Knowledge 1: Archduchess Rosa of Austria
Archduchess "Rosa" Maria Antonie Roberta Josepha Anna Walburga Carmela Ignazia Rita de Cascia of Austria, full German name: "Rosa Maria Antonie Roberta Josepha AnnaWalburga Carmela Ignazia Rita de Cascia, Erzherzogin von Österreich" (22 September 1906, , Salzburg, Salzburg, Austria–Hungary – 17 September 1983, Friedrichshafen, Baden-Württemberg, Germany) was a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth.Through her marriage to Philipp Albrecht, Duke of Württemberg, Rosa was also a member of the House of Württemberg and Duchess consort of Württemberg. [SEP] Knowledge 2: Eldon Howard
Eldon Howard was a British screenwriter.She was the mother- in- law of Edward J. Danziger and wrote a number of the screenplays for films by his company Danziger Productions.

Answer: Archduchess Margarete Sophie of Austria