Princess Nathalie of Sayn-Wittgenstein-Berleburg
Princess Nathalie of Sayn- Wittgenstein- Berleburg( Nathalie Xenia Margrethe Benedikte; born 5 February 1975) is the youngest daughter and child of Prince Richard of Sayn- Wittgenstein- Berleburg and Princess Benedikte of Denmark and niece of Queen Margrethe II of Denmark and Queen Anne- Marie of Greece.
Prince Constantine Alexios of Greece and Denmark
Prince Constantine Alexios of Greece and Denmark( born 29 October 1998) is a member of the Greek royal family, the eldest son and second child of Crown Prince Pavlos and Crown Princess Marie- Chantal of Greece.
He is second in line of succession, after his father, to the former throne of Greece.
His paternal grandparents are Constantine II and Anne- Marie of Denmark, who were the last King and Queen of the Hellenes.
Frederick IX of Denmark
Frederick IX (Christian Frederik Franz Michael Carl Valdemar Georg; 11 March 1899 – 14 January 1972) was King of Denmark from 1947 to 1972.
Born into the House of Glücksburg, Frederick was the elder son of King Christian X and Queen Alexandrine of Denmark.
He became crown prince when his father succeeded as king in 1912.
As a young man, he was educated at the Royal Danish Naval Academy.
In 1935, he was married to Princess Ingrid of Sweden and they had three daughters, Margrethe, Benedikte and Anne-Marie.
During Nazi Germany's occupation of Denmark, Frederick acted as regent on behalf of his father from 1942 until 1943.
Frederick became king on his father's death in early 1947.
During Frederick IX's reign Danish society changed rapidly, the welfare state was expanded and, as a consequence of the booming economy of the 1960s, women entered the labour market.
The modernization brought new demands on the monarchy and Frederick's role as a constitutional monarch.
Frederick IX died in 1972, and was succeeded by his eldest daughter, Queen Margrethe II.
Marie-Chantal, Crown Princess of Greece
Marie- Chantal, Crown Princess of Greece( Marie- Chantal Claire;" née" Miller; born 17 September 1968) is the wife of Pavlos, Crown Prince of Greece, son of Constantine II of Greece and Anne- Marie of Denmark.
Her husband is the heir apparent to the defunct throne of Greece, as the monarchy was abolished in 1973.
She is a Danish princess by marriage, as her husband is a male- line descendant of Christian IX of Denmark.
Princess Maria-Olympia of Greece and Denmark
Princess Maria- Olympia of Greece and Denmark( born 25 July 1996) is an American fashion model, socialite and member of the Greek royal family.
She is the oldest child and only daughter of Pavlos, Crown Prince of Greece and his wife, Marie- Chantal Miller.
Her paternal grandparents are Constantine II of Greece and Anne- Marie of Denmark, who were the last King and Queen of the Hellenes, while her maternal grandfather is duty free entrepreneur Robert Warren Miller.
She is currently sixth in the line of succession to the former throne of Greece, after her father and brothers.
Prince Nikolaos of Greece and Denmark
Prince Nikolaos of Greece and Denmark( born 1 October 1969) is the third child of Constantine II and Anne- Marie of Denmark, who were the last King and Queen of Greece, reigning from 1964 to 1973.
Prince Achileas-Andreas of Greece and Denmark
Prince Achileas- Andreas of Greece and Denmark( born 12 August 2000) is a member of the Greek royal family.
He is the second son and third child of Crown Prince Pavlos of Greece and Marie- Chantal Miller.
His paternal grandparents are Constantine II of Greece and Anne- Marie of Denmark, who were the last King and Queen of the Hellenes.
He is currently third in the line of succession to the former Greek throne.
Queen Anne-Marie of Greece
Queen Anne-Marie of Greece, RE (born Princess Anne-Marie of Denmark on 30 August 1946) is the wife of King Constantine II, who reigned from 1964 until 1973.
Anne-Marie is the youngest daughter of King Frederick IX of Denmark and his wife Ingrid of Sweden.
She is the youngest sister of the reigning Queen Margrethe II of Denmark and cousin of the reigning King Carl XVI Gustaf of Sweden.
Princess Alexia of Greece and Denmark
Princess Alexia of Greece and Denmark( born 10 July 1965) is the eldest child of Constantine II and Anne- Marie of Denmark, who were king and queen of Greece from 1964 until the abolition of the monarchy in 1973.
Pavlos, Crown Prince of Greece
Pavlos, Crown Prince of Greece, RE( born 20 May 1967) is the eldest son and second child of Constantine II, the last King of Greece from 1964 to 1973 and his wife, Anne- Marie of Denmark.
Pavlos was heir apparent to the throne of Greece and was its crown prince from birth, remaining so during his father's reign until the monarchy's abolition.
As a male- line descendant of Christian IX of Denmark, he is also a Danish prince.

Question: When did Queen Anne-Marie Of Greece's father die?
Answer: 14 January 1972