Prince Albert of Monaco, Princess Stephanie of Monaco, Princes Caroline of Hanover, Prince Rainier III
Monaco is a sovereign city state on the Côte d'Azur (French Riviera). Its area is 1.98 km2 with a population of 35,986 as of 2011 and it is the most densely populated country in the world. Monaco also has the world's highest life expectancy at almost 90 years, and the lowest unemployment rate.
Monaco is a principality governed under a form of constitutional monarchy, with Prince Albert II as head of state. The House of Grimaldi has ruled Monaco since 1297, and the state's sovereignty was officially recognized by the Franco-Monegasque Treaty of 1861. Despite Monaco being independent and pursuing its own foreign policy course, its national defence is the responsibility of France. (source)
Thank you Marta!