Amedeo is Vittorio Emanuele's third cousin. The two are related through their common ancestor, King Vittorio Emanuele II of Italy. Amedeo is the son of Emanuele Filiberto, Duke of Aosta, who was the cousin of Vittorio Emanuele's father, King Umberto II.
Ruling the Hearts: A Quiz on Vittorio Emanuele, Prince of Naples