In The Kite Runner, Amir and Hassan grow up together in Afghanistan like brothers, although they couldn't be more different. Amir is the son of a wealthy businessman, a Sunni Muslim, a Pashtun, and he's educated and reads voraciously. Hassan's father is a servant to Amir's father, and Hassan is a Sh'ia Muslim, a Hazara, he's illiterate, and he has a harelip. But neither boy has a mother and they spend their boyhoods roaming the streets of Kabul together.
Khaled Hosseini's The Kite Runner (Bloom's Guides)
In "The Kite Runner", history and personal responsibility come together in the story of Amir, an Afghan boy who is haunted by the guilt of betraying his childhood friend Hassan, the son of his father's servant. In the background loom the many tumultuous changes that have gripped Afghanistan in the years since Amir's carefree kite-flying childhood. From the fall of the monarchy through the Soviet invasion to the mass exodus of refugees to Pakistan and the United States to the rise of the Taliban regime, the story of Amir and Hassan emerges as the story of Afghanistan itself.