Prince Guillaume of Luxembourg is the third son and youngest child of Grand Duke Jean and Grand Duchess Josephine-Charlotte of Luxembourg. Wikipedia
Born: 1963 (age 60 years), Betzdorf Castle, Betzdorf, Luxembourg
Children: Prince Léopold of Nassau
Great-grandparents: Albert I of Belgium, William IV, Grand Duke of Luxembourg, Infanta Maria Antónia of Portugal, and more
Grandparents: Charlotte, Grand Duchess of Luxembourg, Prince Felix of Bourbon-Parma, Astrid of Sweden, and more
Spouse: Princess Sibilla of Luxembourg (m. 1994)
Siblings: Henri, Grand Duke of Luxembourg