Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Friedrich Wilhelm, Prince of Hohenzollern
Friedrich Wilhelm, Prince of Hohenzollern( 3 February 1924 – 16 September 2010) was the head of the Princely House of Hohenzollern for over 45 years.
Prince Carl Christian of Hohenzollern
Prince Carl Christian of Hohenzollern (born 5 April 1962) is the eldest child of Prince Johann Georg of Hohenzollern and of his wife Princess Birgitta of Sweden, sister of King Carl XVI Gustaf of Sweden.
Christian of Oliva
Christian of Oliva, also Christian of Prussia( died 4 December 1245) was the first missionary bishop of Prussia.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Prince Johann Georg of Hohenzollern
Johann Georg, Prince von Hohenzollern ("Johann Georg
Carl Leopold Eitel-Friedrich Meinrad Maria Hubertus Michael"; 31 July 1932 – 2 March 2016) was a German prince, and through his marriage to Princess Birgitta of Sweden, was brother-in-law of King Carl XVI Gustaf of Sweden.
Prince Johann Georg was the sixth child of Frederick, Prince of Hohenzollern
(Heiligendamm 30 August 1891 – Krauchenwies 6 February 1965) and his wife Princess Margarete Karola of Saxony
(Dresden 24 January 1900 – Freiburg im Breisgau 16 October 1962).
Frederick XI, Count of Hohenzollern
Friedrich XI, Count of Hohenzollern( died 26 November 1401), nicknamed" Friedrich the Elder" was a German nobleman.
He was a member of the House of Hohenzollern and a ruling Count of Hohenzollern- Hechingen.
Prince Karl Anton of Hohenzollern
Prince Karl Anton of Hohenzollern- Sigmaringen( 1 September 1868 – 21 February 1919) was a member of the Princely House of Hohenzollern- Sigmaringen.
Karl Anton was the third and youngest son of Leopold, Prince of Hohenzollern and his wife Infanta Antónia of Portugal.
Karl Anton's elder brothers were William, Prince of Hohenzollern and Ferdinand I of Romania.
Frederick XII, Count of Hohenzollern
Friedrich XII, Count of Hohenzollern, nickname Friedrich the Oettinger( before 1401 – 1443) was a German nobleman.
He was a member of the Swabian branch of the House of Hohenzollern.
His father was Friedrich XI, Count of Hohenzollern; his younger brother and rival was Eitel Friedrich I, Count of Hohenzollern.

Question: Who is Prince Carl Christian Of Hohenzollern's paternal grandmother?
Answer: Princess Margarete Karola of Saxony