In Le Conte de Monte Cristo, how does Dantes get revenge on Fernand?

Edmond Dantès exacts revenge on Fernand Mondego by destroying his reputation, which in turn leads to his family turning their backs on him. Mondego's son, Albert, is engaged to be married to Danglars's daughter. The Count sees this as an ideal opportunity to destroy Mondego. He passes on some compromising information to Danglars concerning Mondego's treachery while working for the Ali Pasha, one of France's most loyal foreign allies. As well as betraying Ali Pasha, Mondego also sold his daughter into slavery.
Once the sordid details of Mondego's past come to life, his political career is finished. Not only that, but his son's forthcoming marriage to Danglars's daughter is off. When Albert finds out that Dantès was responsible for exposing his father, he's furious, and challenges him to a duel. But when he shows up on the morning of the duel, Albert apologizes to the Count for his impetuosity. Now that he knows the terrible truth of his father's treacherous acts, he realizes that he's got his just desserts.