Today, Grand Duke Henri abdicates the Luxembourg throne in favor of his eldest son, the new Grand Duke Guillaume. In light of this historic news, get to know the Luxembourg royal family tree:Design by Michael Stillwell The Grand Ducal family of Luxembourg. Grand Duke HenriMark Cuthbert // Getty Images Grand Duke Henri at King Charles’s coronation in 2023.b. Related Story Luxembourg Royal Family Houses Ukrainian RefugeesGrand Duke GuillaumePatrick van Katwijk // Getty Images Guillaume last year. Princess AlexandraSylvain Lefevre // Getty Images Princess Alexandra of Luxembourg and Nicolas Bagory on their wedding day, April 2023.b.