Princess Theodora of Greece and Denmark (1906–1969)
Princess Theodora of Greece and Denmark( 30 May 1906 – 16 October 1969) was the second child and daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg, and the second eldest sister of Prince Philip, Duke of Edinburgh.
Princess Margarita of Greece and Denmark
Princess Margarita of Greece and Denmark( 18 April 1905 – 24 April 1981) was the eldest child and daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg.
She was the first great- great- grandchild of Queen Victoria, and the eldest sister of Prince Philip, Duke of Edinburgh.
Prince Nicholas of Greece and Denmark
Prince Nicholas of Greece and Denmark (22 January 1872 – 8 February 1938), of the Glücksburg branch of the House of Oldenburg, was the fourth child and third son of King George I of Greece, and of Queen Olga.
He was known as "Greek Nicky" in the family to distinguish him from his paternal first cousin Emperor Nicholas II of Russia.
Prince Nicholas was a talented painter, often signing his works as "Nicolas Leprince."
Princess Elizabeth of Greece and Denmark
Princess Elisabeth of Greece and Denmark( 24 May 1904 – 11 January 1955) was the middle daughter of Prince Nicholas of Greece and Grand Duchess Elena Vladimirovna of Russia.
Princess Anastasia of Greece and Denmark
Princess Anastasia of Greece and Denmark ("née" Nonie May Stewart; 20 January 1878 – 29 August 1923) was an American-born heiress and member of the Greek Royal Family.
She was married to Prince Christopher of Greece and Denmark, the youngest child of King George I of Greece and his consort, Grand Duchess Olga Constantinovna of Russia, but was created a princess "suo jure".
George I of Greece
George I (Greek:
Γεώργιος Α΄, Geórgios I; 24 December 1845 – 18 March 1913) was King of Greece from 1863 until his assassination in 1913.
Originally a Danish prince, he was born in Copenhagen, and seemed destined for a career in the Royal Danish Navy.
He was only 17 years old when he was elected king by the Greek National Assembly, which had deposed the unpopular former king Otto.
His nomination was both suggested and supported by the Great Powers: the United Kingdom of Great Britain and Ireland, the Second French Empire and the Russian Empire.
He married the Russian grand duchess Olga Constantinovna of Russia in 1867, and became the first monarch of a new Greek dynasty.
Two of his sisters, Alexandra and Dagmar, married into the British and Russian royal families.
King Edward VII and Tsar Alexander III were his brothers-in-law, and King George V, Tsar Nicholas II, King Christian X of Denmark and King Haakon VII of Norway were his nephews.
George's reign of almost 50 years (the longest in modern Greek history) was characterized by territorial gains as Greece established its place in pre-World War
I Europe.
Britain ceded the Ionian Islands peacefully in 1864, while Thessaly was annexed from the Ottoman Empire after the Russo-Turkish War (1877–1878).
Greece was not always successful in its territorial ambitions; it was defeated in the Greco-Turkish War (1897).
During the First Balkan War, after Greek troops had captured much of Greek Macedonia, George was assassinated in Thessaloniki.
Compared with his own long tenure, the reigns of his successors Constantine, Alexander, and George II proved short and insecure.
Princess Irene, Duchess of Aosta
Princess Irene of Greece and Denmark( 13 February 1904 – 15 April 1974) was the fifth child and second daughter of Constantine I of Greece and his wife, the former Princess Sophie of Prussia.
She was a member of the royal families of Greece and Italy.
From 1941 to 1943 she was also officially Queen Consort of Croatia.
Princess Olga of Greece and Denmark
Princess Olga of Greece and Denmark( Serbian Cyrillic:" Кнегиња Олга Карађорђевић"; 11 June 1903 – 16 October 1997) was a granddaughter of King George I of Greece and wife of Prince Paul, Regent of the Kingdom of Yugoslavia.
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.
Andrée Lafayette
Andrée Lafayette( 1903 – 1989) was a French stage and film actress.
She was the lover of Prince Andrew of Greece and Denmark.

Question: Who is the mother of Prince Nicholas Of Greece And Denmark?
Answer: Olga Constantinovna of Russia