Charlotte of Schaumburg-Lippe
Princess Charlotte of Schaumburg- Lippe( 10 October 1864 – 16 July 1946) was the daughter of Prince Wilhelm Karl August of Schaumburg- Lippe, and his wife, Princess Bathildis of Anhalt- Dessau.
As the second wife of King William II of Württemberg she became Queen consort of Württemberg.
She was not only the last queen of Württemberg, but the last surviving queen of any German state.
Adolf II, Prince of Schaumburg-Lippe
Adolf II, Prince of Schaumburg- Lippe( 23 February 1883 – 26 March 1936) was the last ruler of the small Principality of Schaumburg- Lippe.
Prince Frederick of Schaumburg-Lippe
Prince Frederick of Schaumburg- Lippe( 30 January 186812 December 1945) was a German prince and head of the Náchod branch of the princely house of Schaumburg- Lippe.
He was a son of Prince William of Schaumburg- Lippe, by his wife Princess Bathildis of Anhalt- Dessau.
Heinrich Donatus, Hereditary Prince of Schaumburg-Lippe
Heinrich Donatus, Hereditary Prince of Schaumburg- Lippe( Ernst- August Alexander Wilhelm Bernhard Krafft Heinrich Donatus; born 13 May 1994) is the son of Alexander, Prince of Schaumburg- Lippe and thus heir to the German Princely house of Schaumburg- Lippe.
Prince Heinrich Donatus of Schaumburg- Lippe was born in Hanover to Alexander, Hereditary Prince of Schaumburg- Lippe( born 1958), and Princess Marie- Louise(" Lilly") of Sayn- Wittgenstein- Berleburg( born 1972), who had married in August 1993.
His mother suffered a nervous breakdown in 1998, and left her husband in 2000 to move with her son from Hanover to Munich.
The couple divorced in 2002.
On the death of his father, Philip- Ernst, Prince of Schaumburg- Lippe, Alexander inherited the title Prince of Schaumburg- Lippe, while his son became Hereditary Prince.
In 2007, the Prince of Schaumburg- Lippe married lawyer Nadja Anna Zsoeks.
Princess Marie- Louise is now married to designer Lambros Milona, with whom she has a daughter, Lana.
Princess Bathildis of Anhalt-Dessau
Princess Bathildis of Anhalt- Dessau( 29 December 183710 February 1902) was a Princess of Anhalt- Dessau and member of the House of Ascania by birth.
As the wife of Prince William of Schaumburg- Lippe she was a Princess of Schaumburg- Lippe by marriage.
She was a younger sister of Grand Duchess Adelaide of Luxembourg.
Frederick Christian, Count of Schaumburg-Lippe
Friedrich Christian, Count of Schaumburg- Lippe( 16 August 1655 – 13 June 1728) was the second ruler of the County of Schaumburg- Lippe.
Adolf I, Prince of Schaumburg-Lippe
Adolf I, Prince of Schaumburg-Lippe (1 August 1817 – 8 May 1893) was a ruler of the Principality of Schaumburg-Lippe.
Princess Bathildis of Schaumburg-Lippe
Princess Bathildis of Schaumburg-Lippe (21 May 18736 April 1962) was daughter of Prince William of Schaumburg-Lippe, and consort of Friedrich, Prince of Waldeck and Pyrmont.
Prince William of Schaumburg-Lippe
Prince William of Schaumburg-Lippe (12 December 18344 April 1906) was son of George William, Prince of Schaumburg-Lippe and member of the House of Lippe.
Georg, Prince of Schaumburg-Lippe
Georg, Prince of Schaumburg- Lippe( 10 October 1846 – 29 April 1911) was a ruler of the small Principality of Schaumburg- Lippe.

Question: Who is Princess Bathildis Of Schaumburg-Lippe's paternal grandfather?
Answer: George William, Prince of Schaumburg-Lippe