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.
Princess Henriette of Nassau-Weilburg
Princess Henriëtte of Nassau-Weilburg, then of Nassau (22 April 1780, in Kirchheimbolanden – 2 January 1857, in Kirchheim unter Teck) was a daughter of Prince Charles Christian and Carolina of Orange-Nassau, daughter of William IV, Prince of Orange.
She is an ancestor of branches of the Austrian Imperial and Royal Family and Russian Imperial Family and Dutch Royal Family; the German Royal, Grand Ducal, Ducal, Princely and Princely noble families of: Baden, Bavaria, Hanover, Hohenlohe-Langenburg, Oldenburg, Salm-Salm, Saxe-Weimar-Eisenach, Waldeck and Pyrmont and Wied; in addition to the British, Greek, Romanian, Spanish and Yugoslavian Royal Families.
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.
Countess Claudine Rhédey von Kis-Rhéde
Countess Claudine Rhédey von Kis- Rhéde( baptised 21 September
1812 – 1 October 1841) was the Hungarian wife of Duke Alexander of Württemberg.
Her son, Francis, Duke of Teck, was the father of Mary of Teck, queen consort to George V of the United Kingdom.
Duke Alexander of Württemberg (1771–1833)
Duke Alexander of Württemberg
(Mömpelgard/Montbéliard, then Württemberg (now France), 5 May 1771 – Gotha, Thuringia, Germany, 4 July 1833) was a Duke of Württemberg.
The son of Frederick II Eugene, Duke of Württemberg and of Sophia Dorothea of Brandenburg-Schwedt.
His sister Sophie Dorothea married Tsar Paul I of Russia.
Princess Augusta of Württemberg
Princess Augusta of Württemberg( 4 October 1826 in Stuttgart – 3 December 1898, ibid.) was a daughter of King William I of Württemberg and his wife, Pauline of Württemberg.
Duchess Marie of Württemberg
Duchess Marie of Württemberg (Antoinette Friederike Auguste Marie Anna Herzogin von Württemberg; 17 September 1799 – 24 September 1860) was a daughter of Duke Alexander of Württemberg and Antoinette of Saxe-Coburg-Saalfeld.
She was Duchess of Saxe-Coburg and Gotha from 1832 to 1844 as the second wife of Duke Ernest I.
As such, she was the stepmother of Prince Albert, consort of Queen Victoria.
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.
Duke Alexander of Württemberg (1804–1885)
Duke Alexander Paul Ludwig Konstantin of Württemberg (9 September 1804, Saint Petersburg – 4 July 1885 Tüffer) was the father of Francis, Duke of Teck and the grandfather of Mary of Teck, wife of George V of the United Kingdom.
His father was Duke Louis of Württemberg, brother of King Frederick I of Württemberg and Empress Maria Feodorovna of Russia.
His mother was Princess Henriette of Nassau-Weilburg, a great-granddaughter of George II of Great Britain through his eldest daughter Anne, Princess of Orange.
Duke Alexander of Württemberg (1804–1881)
Duke Alexander of Württemberg( 20 December 1804 – 28 October 1881) was a member of the dynasty which ruled the German kingdom of Württemberg.
To marry a daughter of the French king he agreed that their children would be raised in their mother's faith, thereby becoming ancestor of the Roman Catholic branch of his family.

Question: What nationality is Duke Alexander Of Württemberg (1804–1885)'s mother?
Answer: German