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 Anna
Walburga 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.
Prince Frederick of Württemberg
Prince" Frederick" Charles Augustus of Württemberg( 21 February 1808 – 9 May 1870) was a General in the Army of Württemberg and the father of William II of Württemberg.
Frederick was a member of the Royal Family of Württemberg and a Prince of Württemberg.
Carl, Duke of Württemberg
Carl Maria
Peter Ferdinand Philipp Albrecht Joseph Michael Pius Konrad Robert Ulrich Herzog von Württemberg( born 1 August 1936) is the current head of the House of Württemberg.
Frederick II Eugene, Duke of Württemberg
Friedrich Eugen, Duke of Württemberg( 21 January 1732 – 23 December 1797) was the fourth son of Karl Alexander, Duke of Württemberg, and Princess Maria Augusta of Thurn and Taxis( 11 August 1706 – 1 February 1756).
He was born in Stuttgart.
From 1795 until 1797 he was Duke of Württemberg.
Philipp Albrecht, Duke of Württemberg
Philipp Albrecht, Duke of Württemberg
("George Philipp Albrecht
Carl Maria Joseph Ludwig Hubertus
Stanislaus 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.
Albrecht, Duke of Württemberg
Albrecht, Duke of Württemberg(" Albrecht Maria Alexander Philipp Joseph von Württemberg", 23 December 1865 – 31 October 1939) was the last Württemberger crown prince, a German military commander of the First World War, and the head of the House of Württemberg from 1921 to his death.
Frederick Augustus, Duke of Württemberg-Neuenstadt
Frederick Augustus of Württemberg-Neuenstadt (Neuenstadt am Kocher, 12 March 1654 – 6 August 1716 in Gochsheim) was Duke of Württemberg and second Duke of Württemberg-Neuenstadt.
Archduchess Margarete Sophie of Austria
Archduchess Margarete Sophie of Austria
(Margarete Sophie Marie Annunciata Theresia Caroline Luise Josephe Johanna; 13 May 1870 – 24 August 1902) was a member of the House of Habsburg and an Archduchess of Austria by birth.
She was married to Duke Albrecht of Württemberg,
Princess Catherine of Württemberg
Princess Catherine Frederica Charlotte of Württemberg (Stuttgart, 24 August 1821 – Stuttgart, 6 December 1898) was a daughter of William I of Württemberg and Pauline Therese of Württemberg.
She was the mother of William II of Württemberg.
Christoph, Duke of Württemberg
Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.

Question: When is Philipp Albrecht, Duke Of Württemberg's mother's birthday?
Answer: 13 May 1870