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 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 Wilhelm of Schaumburg-Lippe (b. 1939)
Prince Wilhelm of Schaumburg- Lippe( Wilhelm Friedrich Harald Christian Ernst August Karl Gustav zu Schaumburg- Lippe, born 19 August 1939) is the head of the Nachod branch of the princely house of Schaumburg- Lippe.
Wilhelm is the son of Prince Christian Nicholas of Schaumburg- Lippe, and the great- grandson of Frederick VIII of Denmark.
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.
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.
Prince Harald of Schaumburg-Lippe
Prince Harald of Schaumburg-Lippe (Harald Christian Leopold Gustav; b. 27 March 1948, in Schloss Hagenburg, Niedersachsen) is the third son of Prince Christian of Schaumburg-Lippe and Princess Feodora of Denmark and the great-grandson of Frederick VIII of Denmark, a member of the Danish Royal Family.
He married Petra Wera Kirstein on 22 July 1976; they divorced in 1980.
He married Gabrielle Hagermann on 23 September 1988.
He is in the line of succession to the British throne as a descendant of George II of the United Kingdom's daughter Queen Caroline Matilda of Denmark and Norway.
Princess Feodora of Denmark
Princess Feodora of Denmark (
Feodora Louise Caroline-Mathilde Viktoria Alexandra Frederikke Johanne)
(3 July 1910 – 17 March 1975) was a Danish princess as a daughter of Prince Harald of Denmark and granddaughter of Frederick VIII of Denmark.
As the wife of Prince Christian of Schaumburg-Lippe
she became a Princess of Schaumburg-Lippe by marriage.
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.
Wolrad, Prince of Schaumburg-Lippe
Ernst Wolrad, Prince of Schaumburg- Lippe( 19 April 1887 – 15 June 1962) was a head of the Princely House 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.

Question: Who is Prince Harald Of Schaumburg-Lippe's maternal grandfather?
Answer: Prince Harald of Denmark