Question: Margrethe II of Denmark has a son who is sixth in line to succeed the Danish throne, behind which elder brother?
Context: John (Danish and Norwegian: "Hans" ; Swedish: "Johan" ; né "Johannes") (2 February 1455 – 20 February 1513) was a Scandinavian monarch under the Kalmar Union.  He was King of Denmark (1481–1513), Norway (1483–1513) and as John II (Swedish: "Johan II" ) Sweden (1497–1501).  From 1482 to 1513, he was concurrently Duke of Schleswig and Holstein in joint rule with his brother Frederick.  He currently remains the only King of Denmark since the mid-15th century to not be named Christian or Frederick, if one does not include the current Queen of Denmark, Margrethe II. Prince Joachim of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (] ; Joachim Holger Waldemar Christian; born 7 June 1969 at Rigshospitalet in Copenhagen) is the younger son of Queen Margrethe II and Prince Henrik.  Joachim is sixth in the line of succession to the Danish throne, following his elder brother, Crown Prince Frederik, and Frederik's four children. The House of Laborde de Monpezat (] ) is a French family, known since the seventeenth century, associated with the Danish Royal Family by marriage after 1967, when Henri de Laborde de Monpezat wed Princess Margrethe of Denmark, heir presumptive of the ruling House of Glücksburg.  In the event of ascension to the Danish throne of their son or male-line descendant, the main branch of the Danish Royal Family will belong patrilineally to the "Laborde de Monpezat" lineage.  However, it is unclear which name the royal family will use in this event. Lord Blayney, Baron of Monaghan, in the County of Monaghan, was a title in the Peerage of Ireland.  It was created in 1621 for the soldier Sir Edward Blayney.  He was succeeded by his son, the second Baron.  He was killed at the Battle of Benburb in 1646.  His younger son, the fourth Baron (who succeeded his elder brother), represented County Monaghan in the Irish House of Commons.  His elder son, the fifth Baron, was attainted by the Parliament of James II for supporting William of Orange.  He had no sons and was succeeded by his younger brother, the sixth Baron.  He was Governor of County Monaghan.  His son, the seventh Baron, was Lord Lieutenant of County Monaghan.  He was succeeded by his elder son, the eighth Baron.  He was a clergyman and served as Dean of Killaloe.  He had no surviving children and was succeeded by his younger brother, the ninth Baron.  He was a Lieutenant-General in the Army.  His younger son, the eleventh Baron (who succeeded his elder brother), was also a Lieutenant-General in the Army and fought in the Peninsular War.  Lord Blayney also represented the rotten borough of Old Sarum in Parliament.  His son, the twelfth Baron, sat as Conservative Member of Parliament for County Monaghan and was later an Irish Representative Peer from 1841 until his death.  On his death in 1874 the title became extinct. Prince Christian of Denmark, Count of Monpezat (Christian Valdemar Henri John; born 15 October 2005) is the elder son and eldest child of Crown Prince Frederik and Crown Princess Mary.  He is a grandson of Queen Margrethe II and her husband Prince Henrik.  He is second in the Danish line of succession, after his father.  His sister Isabella is immediately after him in the line of succession. The Danish Act of Succession of 27 March 1953 was accepted after a 1953 referendum in Denmark and dictates the rules governing the line of succession to the Danish throne.  The 1953 referendum changed the act so that it became possible for a woman to inherit the throne in the event that she has no older or younger brothers, a system known as male-preference cognatic preference primogeniture.  As the reigning King Frederick IX had three daughters and no sons, this meant that Princess Margrethe became the heir presumptive instead of her uncle Prince Knud.  As Frederick IX's wife Ingrid of Sweden was not expected to (and in fact did not) have any more children, this effectively ensured that Princess Margrethe would become Queen of Denmark, which she did. Margrethe II (Danish: "Margrethe 2."  , ] ; Faroese: "Margreta 2."  ; Greenlandic: "Margrethe II" ; full name: "Margrethe Alexandrine Þórhildur Ingrid"; born 16 April 1940) is the Queen of Denmark.  She is also the supreme authority of the Church of Denmark and Commander-in-Chief of the Danish Defence.  Born into the House of Glücksburg, a royal house with origins in Northern Germany, she was the eldest child of Frederick IX of Denmark and Ingrid of Sweden.  She succeeded her father upon his death on 14 January 1972, having had become heir presumptive to her father in 1953, when a constitutional amendment allowed women to inherit the throne.  On her accession, Margrethe became the first female monarch of Denmark since Margaret I, ruler of the Scandinavian kingdoms in 1375–1412 during the Kalmar Union.  In 1967, she married Henri de Laborde de Monpezat, with whom she has two sons: Crown Prince Frederik (born 1968) and Prince Joachim (born 1969).  She has been on the Danish throne for 45 years, becoming the second-longest-reigning Danish monarch after her ancestor Christian IV. Frederik, Crown Prince of Denmark, Count of Monpezat, {'1': ", '2': ", '3': 'RE, SKmd', '4': "} (Frederik André Henrik Christian; born 26 May 1968) is the heir apparent to the throne of Denmark.  Frederik is the elder son of Queen Margrethe II and Henrik, the Prince Consort. Queen Margrethe II Land (Danish: "Dronning Margrethe II Land" ) is a peninsula in the northern limit of King Christian X Land, northeastern Greenland.  Administratively it belongs to the NE Greenland National Park area. Princess Elisabeth of Denmark, {'1': ", '2': ", '3': 'RE', '4': "} ("Elisabeth Caroline-Mathilde Alexandrine Helena Olga Thyra Feodora Estrid Margrethe Désirée"; born 8 May 1935 in Copenhagen) is the daughter of Hereditary Prince Knud and Hereditary Princess Caroline-Mathilde of Denmark, and is a first cousin of the present Danish monarch, Queen Margrethe II.
Answer: Crown Prince Frederik