Queen Beatrix has three sons: Willem-Alexander (born in 1967), Johan Friso (born in 1968) and Constantijn (born in 1969). As the eldest son, Willem-Alexander is the crown prince and will take the throne after his mother. We don’t yet know when this will happen. Queen Beatrix was married to Claus van Amsberg, who was born in Germany. He died in 2002. The Dutch liked him very much.