There are clearly a number of different examples of irony operating in the book on a number of different levels. My own personal favorite example of irony in this great novel, and one that is central to the action, is the relationship between Baba and his son, Amir, and how Amir is so completely different from Baba, the bear-wrestling, strong and unyielding individual who exudes his strength and charisma throughout the entire novel. As Baba himself says in Chapter 3:
"If I hadn't seen the doctor pull him out of my wife with my own eyes, I'd never believe he's my son."
The irony of the situation is that Amir is Baba's son, in spite of how radically different he is from Baba. Yet, although he has such an "unpromising" start, through the course of the novel Amir goes on to learn and express the same bravery and strength that Baba possesses in his quest to free Hassan's son.