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.
Karl Anton, Prince of Hohenzollern
Prince Karl Anton of Hohenzollern- Sigmaringen( 7 September 1811 – 2 June 1885) was head of the Princely House of Hohenzollern- Sigmaringen, Hohenzollern from 1869 and Prime Minister of Prussia.
He was the son of Karl, Prince of Hohenzollern- Sigmaringen, who abdicated in favour of his son on 27 August 1848, and his first wife Marie Antoinette Murat, niece of Joachim Murat.
Karl Friedrich, Prince of Hohenzollern
Karl Friedrich, Prince of Hohenzollern (born 20 April 1952) is the eldest son of the late Friedrich Wilhelm, Prince of Hohenzollern and Princess Margarita of Leiningen.
He became head of the Princely House of Hohenzollern, the Roman Catholic Swabian branch of the dynasty, upon his father's death on 16 September 2010.
Alexander, Hereditary Prince of Hohenzollern
Alexander, Hereditary Prince of Hohenzollern( born 16 March 1987 in New York City) is a member of the Princely House of Hohenzollern.
Alexander is the eldest son of Karl Friedrich, Prince of Hohenzollern and Countess Alexandra Schenck von Stauffenberg, who divorced in 2010.
He is the heir apparent to the headship of the princely house.
Philipp, Prince of Hohenzollern-Hechingen
Philipp Christoph Friedrich, Prince of Hohenzollern- Hechingen( 24 June 1616 in Hechingen – 24 January 1671 in Hechingen) was a German nobleman.
He was the third prince of Hohenzollern- Hechingen.
Princess Margarita of Leiningen
Princess Margarita of Leiningen
(Full German name: "
Margarita Ileana Viktoria Alexandra Prinzessin zu Leiningen")
(born 9 May 1932 in Coburg, Bavaria, Germany; committed suicide on 16 June 1994 in Überlingen, Baden-Württemberg, Germany) was a Princess of Leiningen by birth and the Princess of Hohenzollern by marriage.
Margarita was the fourth child and second-eldest daughter of Karl, 6th Prince of Leiningen and his wife Grand Duchess Maria Kirillovna of Russia.
Margarita was the Princess consort of Hohenzollern 6 February 1966 – 16 June 1994.
Karl Friedrich, Prince of Hohenzollern-Sigmaringen
Karl Friedrich (9 January 1724 – 20 December 1785) was a member of the House of Hohenzollern and Prince of Hohenzollern-Sigmaringen, Lord of Haigerloch and Wehrstein from 1769 until his death.
Born in Sigmaringen, he was the eldest son of Joseph Friedrich Ernst, Prince of Hohenzollern-Sigmaringen and his first wife, Maria Franziska Louise of Oettingen-Spielberg.
From the nine children that his father produced in his first and second marriage, only Karl Friedrich and a young full-sister, Maria Johanna (who became a nun) survived adulthood.
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, Prince of Hohenzollern
Frederick, Prince of Hohenzollern( 30 August 1891 in Heiligendamm, Mecklenburg- Schwerin – 6 February 1965 in Krauchenwies, Baden- Württemberg, Germany) was the eldest son of William, Prince of Hohenzollern and Princess Maria Teresa of Bourbon- Two Sicilies.
He had a twin brother, Franz Joseph, Prince of Hohenzollern- Emden, who was born a few minutes after he was.
Constantine, Prince of Hohenzollern-Hechingen
Constantin, Prince of Hohenzollern- Hechingen( Friedrich Wilhelm Konstantin Hermann Thassilo; 16 February 1801 – 3 September 1869), was the last Prince of Hohenzollern- Hechingen.
Constantine was the only child of Frederick, Prince of Hohenzollern- Hechingen and his wife, Princess Pauline of Courland, the daughter of the last Duke of Courland, Peter von Biron.

Question: Who is the maternal grandmother of Karl Friedrich, Prince Of Hohenzollern?
Answer: Grand Duchess Maria Kirillovna of Russia