The Godfather Trilogy

In the United States in the 1940s, "Godfather" Vito Corleone (played by Marlon Brando) was the leader of the Corleone family of the Mafia. He led the family to engage in illegal activities, but at the same time he was also the patron saint of many weak civilians and was deeply loved by people. The conflict between the Corleone family and several other New York Mafia families intensified because they rejected the drug lord Soloso's drug deal requirements. On Christmas Eve, Soloso kidnapped Tom, the "Godfather's" adviser, and sent someone to assassinate the "Godfather". Due to the betrayal of the traitor, the "Godfather"'s eldest son Sunni was killed by his enemies; the younger son Mike (played by Al Pacino) was also involved and lost his beloved wife. The conflicts between Mafia families are becoming more and more intense. How does the old "godfather" lead the overall situation when facing the pain of losing his son? How does the vendetta between the mafia end? Who is the traitor in the family? Who can become the "godfather" of the new generation?