Question: Princess Maria Gabriella of Savoy, is the middle daughter of Italy's last king, Umberto II, and Marie José of Belgium, the "May Queen", and a sister of which pretender to their father's throne, the only son of Umberto II, the last King of Italy, and his wife, Marie-José of Belgium?
Sentence (from "Vittorio Emanuele, Prince of Naples"): Vittorio Emanuele of Savoy, Prince of Naples (Vittorio Emanuele Alberto Carlo Teodoro Umberto Bonifacio Amedeo Damiano Bernardino Gennaro Maria di Savoia; born 12 February 1937) is the only son of Umberto II, the last King of Italy, and his wife, Marie-José of Belgium.
Relevant evidence: Yes