Question: Who is the maternal grandfather of Princess Christina Margarethe Of Hesse?

Princess Christina Margarethe of Hesse
Princess Christina Margarethe of Hesse (10 January 1933 – 22 November 2011) was the eldest daughter of Prince Christoph of Hesse, nephew of Germany's last emperor Wilhelm II, and of Princess Sophie of Greece and Denmark.
A niece by marriage of Elizabeth II of the United Kingdom, from 1956 to 1962 she was married to Prince Andrew of Yugoslavia, a son of Alexander I of Yugoslavia.
Landgravine Auguste of Hesse-Homburg
Landgravine" Auguste" Fredericka of Hesse- Homburg( full German name:" Auguste Friederike, Landgräfin von Hessen- Homburg"; 28 November 1776, Bad Homburg vor der Höhe, Landgraviate of Hesse- Homburg, Holy Roman Empire – 1 April 1871, Ludwigslust, Grand Duchy of Mecklenburg- Schwerin), was a member of the House of Hesse and a Landgravine of Hesse- Homburg by birth.
Through her marriage she was also a member of the House of Mecklenburg and Hereditary Grand Duchess of Mecklenburg- Schwerin.
She was the sixth child and fourth daughter of Frederick V, Landgrave of Hesse- Homburg and his wife Landgravine Caroline of Hesse- Darmstadt, in turn daughter of Louis IX, Landgrave of Hesse- Darmstadt.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Philip, Landgrave of Hesse-Philippsthal
Philip of Hesse- Philippsthal( 14 December 1655 – 18 June 1721) was the son of William VI, Landgrave of Hesse- Kassel and Hedwig Sophia of Brandenburg.
He was the first landgrave of Hesse- Philippsthal from 1663 to 1721 and the founder of the fifth branch of the house of Hesse.
Charles I, Landgrave of Hesse-Philippsthal
Charles I, Landgrave of Hesse- Philippsthal( 23 September 1682 – 8 May 1770) was a member of the House of Hesse and Landgrave of Hesse- Philippsthal from 1721 until his death.
Charles I, Landgrave of Hesse-Kassel
Charles of Hesse- Kassel( 3 August 1654 – 23 March 1730), of the House of Hesse, was the Landgrave of Hesse- Kassel from 1670 to 1730.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Louis I, Grand Duke of Hesse
Louis I, Grand Duke of Hesse( 14 June 1753 in Prenzlau – 6 April 1830 in Darmstadt) was" Landgrave of Hesse- Darmstadt"( as" Louis X") and later the first" Grand Duke of Hesse and by Rhine".
Prince Wilhelm of Hesse-Philippsthal-Barchfeld
Prince Wilhelm of Hesse(" Wilhelm Ernst Alexis Hermann"; 1 March 1905 – 30 April 1942) was German soldier and heir to the headship of the Hesse- Philippsthal line of the House of Hesse.
As a member of the House of Hesse he was styled" His Highness Prince Wilhelm of Hesse".
Princess Sophie of Greece and Denmark
Princess Sophie of Greece and Denmark (26 June 1914 – 24 November 2001) was the fourth child and youngest daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg.
The Duke of Edinburgh is her younger brother.
Sophie was born at the villa Mon Repos on the island of Corfu in Greece.

Answer: Prince Andrew of Greece and Denmark