In Belgium, Clement Vandenkerckhove, a 26-year-old former car salesman, has recently been formally recognised as the son of Prince Laurent, the younger brother of the country’s king, Philippe. Vandenkerckhove was born out of wedlock when his mother, the Belgian singer Wendy Van Wanten, and Prince Laurent had a relationship in the 1990s. A DNA test confirmed the paternity, and a private ceremony earlier this year made Vandenkerckhove a prince of Belgium and gave him rights to his father’s private...