Question: Prince Floris Frederik Martijn of Orange-Nassau is the youngest son of a of the Dutch Royal House and currently eighth and last in the line of what?

Context paragraphs:
Princess Margriet of the Netherlands: Princess Margriet of the Netherlands (Margriet Francisca; born 19 January 1943) is the third daughter of Queen Juliana and Prince Bernhard.  As an aunt of the reigning monarch, King Willem-Alexander, she is a member of the Dutch Royal House and currently eighth and last in the line of succession to the throne.

Royal house of Sulu: The Royal House of Sulu is an Islamic royal house which ruled the Sulu Sultanate (now part of Indonesia, Malaysia and the Philippines).  In 1962, Philippine Government under the leadership of President Diosdado Macapagal officially recognised the continued existence of the Royal Sultanate of Sulu.  On 24 May 1974 Sultan Mohammad Mahakuttah Kiram, under Memo Order 427, which was issued by Philippines President Ferdinand Marcos.  Memo Order 427 states that "The Government has always recognised the Sultanate of Sulu as the legitimate claimant to the historical territories of the Republic of Philippines".  The Memo Order 427 states that Mahakuttah A. Kiram (reigned 1974–1986) is officially the recognised Sultan of Sulu.  Sultan Mahakuttah A. Kiram eldest son Datu Muedzul Lail Tan Kiram was officially crowned Raja Muda (Crown Prince, heir to the Throne) of the Sultanate of Sulu.  He was crowned Raja Muda (Crown Prince) on the same day His Majesty’s father Mahakuttah A. Kiram was officially crowned Sultan of Sulu.  Muedzul Lail Tan Kiram became the Head of the Royal House of Sulu on 16 February 1986.  As the eldest son of the former Sultan, he is the legitimate heir claimant to the throne of the Sultanate of Sulu.  The current ruling lineage is the Royal House of Kiram.  The Royal House of Kiram descends from Sultan Jamalul Kiram I, who was the Sultan of Sulu from 1823–1844.

Prince Floris of Orange-Nassau, van Vollenhoven: Prince Floris Frederik Martijn of Orange-Nassau, van Vollenhoven (born Nijmegen, 10 April 1975) is the fourth and youngest son of Princess Margriet of the Netherlands and Pieter van Vollenhoven.

Princess Alexia of the Netherlands: Princess Alexia of the Netherlands, Princess of Orange-Nassau (Alexia Juliana Marcela Laurentien; born 26 June 2005) is the second daughter of King Willem-Alexander and Queen Máxima.  Princess Alexia is member of the Dutch Royal House and second in the line of succession to the Dutch throne.

Prince Constantijn of the Netherlands: 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 of Orange-Nassau and currently fourth in the line of succession to the Dutch throne.

Prince Frederick of Orange-Nassau: Frederick, Prince of Orange-Nassau (English: William George Frederick , Dutch: "Willem George Frederik" ; 15 February 1774 6 January 1799) was the youngest son of William V, Prince of Orange and Stadtholder of the Dutch Republic and Princess Wilhelmina of Prussia, sister of King Frederick William II.  Commonly called Fritz inside the family, he chose a military career with the Holy Roman Empire, he died of a fever while serving in Padua, Italy.

The Royal House of Boureh Gnilane Joof: The Royal House of Boureh Gnilane Joof (variation : Mbin Boureh Gnilane in Serer) was a royal house founded in the 14th century by Jaraff Boureh Gnilane Joof (var : "Bouré Gnilane Diouf" or "Buré Ñilaan").  He was a member the Serer tribe, from the pre-colonial Kingdom of Sine now part of independent Senegal.  It was the first royal house founded by the Joof family during the Guelowar period (1350 - 1969).  Boureh Gnilane Joof was a royal prince and a Jaraff (var : "Diaraf"), a with the powers of a Prime Minister.  He was neither a Maad a Sinig (king of Sine) nor a Maad Saloum (king of Saloum) but a royal prince who had the title "Jaraff" bestowed upon him by his cousin and brother-in-law - Maad a Sinig Diessanou Faye (king of Sine).  His father Maad Patar Kholleh Joof (the conqueror) was the king of Laa and Teigne of Baol (king of Baol).  Boureh's brothers were the first from this house to have succeeded to the throne of Sine during the Guelowar period.  His name was adopted in his honour to refer to the first royal house founded by the Joof family during this dynastic period.  The Joof family of Sine, from this royal house also ruled in the Kingdom of Saloum (the Joof paternal dynasty of Sine and Saloum) The Joof family also ruled in Baol (the Joof paternal dynasty of Baol).  From the date of its foundation up to the abolition of the Serer monarchies of Sine and Saloum in 1969, at least ten kings from this house had succeeded to the throne of Sine.  As the first royal house of Sine founded by the Joof family in this dynastic period, the Royal House of Boureh Gnilane Joof holds great significance in Senegambian, Joof family and , because all the subsequent royal houses founded by the Joof family (who ruled in three Senegambian kingdoms) branched out from this royal house.

Prince Friso of Orange-Nassau: Prince Friso of Orange-Nassau (Dutch: "Johan Friso Bernhard Christiaan David van Oranje-Nassau van Amsberg" ; 25 September 1968 – 12 August 2013) was a younger brother of King Willem-Alexander of the Netherlands.  Prince Friso was a member of the Dutch Royal Family, but because of his marriage without an Act of Consent in 2004, he lost his membership of the Dutch Royal House and was no longer in the line of succession to the throne.

Order for Loyalty and Merit: The Order for Loyalty and Merit (Dutch: "Orde van Trouw en Verdienste" ) is a house order of the Dutch Royal House of Orange-Nassau.  The Order came into being as a result of Queen Juliana's reorganization of The House Order of Orange (Huisorde van Oranje) in 1969.

Princess Ariane of the Netherlands: Princess Ariane of the Netherlands, Princess of Orange-Nassau (Ariane Wilhelmina Máxima Inés; born 10 April 2007) is the third and youngest daughter of King Willem-Alexander and Queen Máxima.  Princess Ariane is a member of the Dutch Royal House and currently third in the line of succession to the Dutch throne.

Supporting paragraphs: Prince Floris of Orange-Nassau, van Vollenhoven Princess Margriet of the Netherlands
Answer: succession to the throne