Wow...they lucky...have 2 houses. Cool, eh?
House:
House of Bourbon-Parma
House of Nassau-Weilburg
[1]
Henri, Grand Duke of Luxembourg (given names: Henri Albert Gabriel Félix Marie Guillaume; born at Betzdorf Castle in Betzdorf, Luxembourg, 16 April 1955) is the head of state of Luxembourg. He is the eldest son of Jean, Grand Duke of Luxembourg and Princess Joséphine-Charlotte of Belgium. His maternal grandparents were King Leopold III of Belgium and Astrid of Sweden. He is a nephew of the current King of Belgium, Albert II.
[2]
All Dutch kings since 1890 and the Grand Dukes of Luxembourg since 1912 have been descended in the female line from the House of Nassau. According to German tradition, the family name is passed only in the male line of succession. The house is therefore, from this perspective, extinct. However Dutch aristocratic customs (and Luxembourg's, which are based on the aforementioned) differ, and do not consider the House extinct.
[3]
The House of Bourbon is an important European royal house, a branch of the Capetian dynasty. Bourbon kings first ruled Navarre and France in the 16th century. By the 18th century, members of the Bourbon dynasty also held thrones in Spain, Naples & Sicily, and Parma. Spain and Luxembourg currently have Bourbon monarchs.