Question: Who is the maternal grandfather of Sophie Of Württemberg, Duchess Of Saxe-Weimar?

Context paragraphs:
title: Sophie of Württemberg
paragraph_text: Sophie of Württemberg ( Sophia Frederika Mathilde; 17 June 1818 – 3 June 1877) was Queen of the Netherlands as the first wife of King William III.
title: Princess Catherine of Württemberg
paragraph_text: 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.
title: Prince Frederick of Württemberg
paragraph_text: 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.
title: Princess Augusta of Württemberg
paragraph_text: 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.
title: Anna Maria of Brandenburg-Ansbach
paragraph_text: Anna Maria of Brandenburg-Ansbach (28 December 1526 – 20 May 1589) was a German princess of Brandenburg-Ansbach. Anna Maria was born at Jägerndorf, the eldest daughter of George, Margrave of Brandenburg-Ansbach and his second wife Hedwig of Münsterberg-Oels, daughter of Charles I of Münsterberg-Oels. Anna Maria was brought up as a Lutheran and on 24 February 1544 became the wife of Christoph, Duke of Württemberg. She later acted as guardian to her son Ludwig III, Duke of Württemberg early in his reign. After the death of her husband Christoph she lived more than 20 years in the Nürtingen castle, she died in Nürtingen. After losing both her husband and her eldest son in 1568, Anna Maria fell madly in love with the young Landgrave George I of Hesse-Darmstadt (1547–1596). Soon afterwards she became mentally confused and was locked up. George I later married her daughter Eleonore. She died in 1589 and was buried in the St. George's Collegiate Church in Tübingen.
title: Philipp Albrecht, Duke of Württemberg
paragraph_text: 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.
title: Louis Frederick, Duke of Württemberg-Montbéliard
paragraph_text: Louis Frederick of Württemberg- Montbéliard( 29 January 1586 in Montbéliard – 26 January 1631 in Montbéliard) was the founder of a cadet line of the House of Württemberg known as the Dukes of Württemberg- Montbéliard. Louis Frederick of Württemberg was born at Montbéliard Castle as the fifth child and second son of Duke Frederick I of Württemberg, and princess Sibylla of Anhalt.
title: Christoph, Duke of Württemberg
paragraph_text: Christoph of Württemberg, Duke of Württemberg (12 May 1515 – 28 December 1568) ruled as Duke of Württemberg from 1550 until his death in 1568.
title: Sophie of Württemberg, Duchess of Saxe-Weimar
paragraph_text: Sophie of Württemberg (20 November 1563 - 21 July 1590), was a German noblewoman member of the House of Württemberg and by marriage Duchess of Saxe-Weimar. Born in Stuttgart, she was the youngest of twelve children born from the marriage of Christoph, Duke of Württemberg and Anna Maria of Brandenburg-Ansbach. From her eleven older siblings, nine survive adulthood: Eberhard, Hereditary Prince of Württemberg, Hedwig (by marriage Landgravine of Hesse-Marburg), Elisabeth (by her two marriages Countess of Henneberg-Schleusingen and Countess Palatine of Veldenz-Lauterecken), Sabine (by marriage Landgravine of Hesse-Kassel), Emilie (by marriage Countess Palatine of Simmern-Sponheim), Eleonore (by her two marriages Princess of Anhalt and Landgravine of Hesse-Darmstadt), Louis III, Duke of Württemberg, Dorothea Maria (by marriage Countess Palatine of Sulzbach) and Anna (by her two marriages Duchess of Oława and Legnica).
title: Duke Alexander of Württemberg (1804–1885)
paragraph_text: 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.

Reasoning steps:
Sophie of Württemberg mother Anna Maria of Brandenburg-Ansbach
Anna Maria of Brandenburg-Ansbach father George

Answer: spans: George