He is the eldest son of Antoine, 13th Prince de Ligne, and his wife, Princess Alix of Luxembourg; he is thus a nephew of the late Jean, Grand Duke of Luxembourg, and a cousin of reigning Grand Duke Henri.
Antoine, 13th Prince de Ligne's eldest son with Princess Alix of Luxembourg as his wife, makes him a nephew of the late Jean, Grand Duke of Luxembourg, and a cousin to the current Grand Duke Henri.