Who is Nino Mancuso from History: A Novel and what is their importance?

Ida's eldest child, Nino, is her son by Alfio Mancuso. Nino is rebellious and disrespectful toward his mother, but is still lovable. He loves his new baby brother and promises him the world, fully intending to deliver but not quite coming through for Useppe as he promises. Nino is a rebel, even if he needs to change his stance. In the beginning of the story, he rails in support of the fascists. However, as time goes on, he joins a militant faction fighting against the Nazis.