Title: Monarchy of the Netherlands
Content: HM King Willem-Alexander, The King of the Netherlands (the sovereign) ; HM Queen Maxima, The Queen of the Netherlands (the king's wife) ; HRH Princess Beatrix of the Netherlands (the king's mother and predecessor) ; HRH Princess Catharina-Amalia, The Princess of Orange (the king's first daughter and heir) ; HRH Princess Alexia of the Netherlands (the king's second daughter) ; HRH Princess Ariane of the Netherlands (the king's third daughter) ; HRH Prince Constantijn of the Netherlands (the king's brother) ; HRH Princess Laurentien of the Netherlands (the king's sister-in-law) ; HRH Princess Margriet of the Netherlands (the king's aunt) ; Prof. Pieter van Vollenhoven (the king's uncle) According to the official website the members of the royal house are currently:
Title: Dutch royal house
Content: The King (King Willem-Alexander of the Netherlands), the current head of the royal house, oldest child of Queen Beatrix ; The Queen (Queen Máxima), wife of the King ; The Princess of Orange (Catharina-Amalia), eldest child of the King and Queen ; Princess Alexia, middle child of the King and Queen ; Princess Ariane, youngest child of the King and Queen ; Prince Constantijn, third and youngest child of Queen Beatrix and Prince Claus ; Princess Laurentien, wife of Prince Constantijn  Princess Beatrix, formerly Queen Beatrix Princess Margriet, sister of Queen Beatrix; an exception was made for her when the act was revised Pieter van Vollenhoven, husband of Princess Margriet
Title: Monarchy of the Netherlands
Content:  The current monarch is King Willem-Alexander (born 1967), who has been on the Throne since 30 April 2013. He studied history at the University of Leiden and became actively involved in water management. His wife is Queen Máxima (née Máxima Zorreguieta Cerruti), an economics major, whose father was a minister of agriculture in the dictatorial regime under General Videla in Argentina. Because of that their relationship was accompanied by fierce public debate and only officially sanctioned after quiet diplomacy, resulting in Máxima's father agreeing not to be present on their wedding day (2 February 2002). Former minister Max van der Stoel and 
Title: Queen Máxima of the Netherlands
Content:  Máxima (born Máxima Zorreguieta Cerruti; 17 May 1971) is the queen of the Netherlands as the spouse of King Willem-Alexander. Argentine by birth, she worked in marketing when she met Willem-Alexander, eldest son and heir apparent of Queen Beatrix, in 1999. They married in 2002, and became king and queen on the abdication of her mother-in-law in 2013. As princess and as queen, Máxima has promoted social integration of immigrants, LGBT rights, and financial inclusion. She and Willem-Alexander have three daughters, Princesses Catharina-Amalia, Alexia, and Ariane, who are first, second, and third, respectively, in the line of succession.
Title: Wassenaar
Content: Willem-Alexander of the Netherlands (born 1967) King of the Netherlands ; Queen Máxima of the Netherlands (born 1971) spouse of King Willem-Alexander ; Catharina-Amalia, Princess of Orange (born 2003) heir apparent to the throne of the Kingdom of the Netherlands ; Princess Alexia of the Netherlands (born 2005) second daughter of King Willem-Alexander and Queen Máxima ; Princess Ariane of the Netherlands (born 2007) third daughter of King Willem-Alexander and Queen Máxima 
Title: Prince Constantijn of the Netherlands
Content:  Prince Constantijn of the Netherlands (Constantijn Christof Frederik Aschwin; born 11 October 1969) is the third and youngest son of the former Dutch queen, Beatrix, and her husband, Claus von Amsberg, and is the younger brother of the reigning Dutch king, Willem-Alexander. He is a member of the Dutch Royal House and currently fourth in the line of succession to the Dutch throne.
Title: Queen Máxima of the Netherlands
Content:  By a decree issued on 25 January 2002, upon the solemnization of marriage, Máxima Zorreguieta was granted the titles Princess of the Netherlands and Princess of Orange-Nassau, and the style Royal Highness was formally conferred upon her. She also became "mevrouw van Amsberg" (Mrs. van Amsberg). Another decree issued on the same day also granted her own personal coat of arms and a personal standard. On 13 May 2011, the Dutch parliament confirmed that Máxima would become queen consort of the Netherlands upon her husband's accession, after a debate over her future title and style. On 28 January 2013, it was announced that Queen Beatrix would abdicate on 30 April in favour of Willem-Alexander. Máxima is the kingdom's first queen consort since Princess Emma of Waldeck and Pyrmont, the second wife of William III. She is the first Dutch queen to have been born as a commoner, and the first to have been born outside Europe.
Title: Monarchy of the Netherlands
Content:  Minister Wim Kok seem to have played a crucial role in this process. On 7 December 2003 Princess Máxima gave birth to a daughter: Princess Catharina-Amalia. On 26 June 2005 another daughter was born: Princess Alexia. On 10 April 2007 a third daughter was born, Princess Ariane. They are first, second and third in line to the Dutch throne. His mother, Queen Beatrix announced that she would be abdicating the Throne on 30 April 2013. On that day, Willem-Alexander became the new King and was sworn in and inaugurated in the Nieuwe Kerk in Amsterdam, in a session of the States-General.
Title: List of Dutch royal consorts
Content:  A consort of the Netherlands is a person married to a Dutch monarch during his or her reign. All female spouses of the monarchs of the Netherlands have been titled "Queen of the Netherlands" with the style Majesty. The male spouses of the three Queens regnant of the Netherlands were titled "Prince of the Netherlands" with the style Royal Highness. The spouse of the Bonaparte King of Holland was "Queen of Holland" with the style Majesty. The following spouses of the monarchs of Holland between 1806 and 1810; and the Netherlands since 1813:
Title: Constitution of the Netherlands
Content:  Article 24 stipulates that there is kingship and that this kingship is held by William I of the Netherlands and his lawful successors. Articles 25 and 26 regulate the line of succession to the Dutch throne; since 1983 female successors have equal rights to the throne. Further articles regulate abdication (Article 27); parliamentary approval of royal marriage on penalty of loss of the right to the throne (Art. 28); the exclusion of unfit possible heirs (Art. 29); appointment of a successor if heirs are absent (Art. 30 and 31); the oath and inauguration in the capital of the Netherlands, Amsterdam (Art. 32); the age of royal majority at eighteen (Art. 33); guardianship over a minor King (Art. 34); declaration by Parliament of the King's inability (Art. 35); temporary relinquishment of the exercise of royal authority (Art. 36); regency (Art. 37 and 38); the membership of the Royal House (in practice mainly consisting of members of the House of Orange) (Art. 39); its payment (Art. 40) and the organisation of the royal household by the King (Art. 41).

Question: who is the king and queen of the netherlands?
Answer: Queen Máxima of the Netherlands.
King Willem-Alexander.