Amir put his watch and some money in Hassan's mattress. Hassan found these items and told Ali about how he got raped while Amir hid and watched, so they left Kabul.
Hassan and Ali give Amir a leather-bound notebook for his birthday.
Amir frames Hassan for stealing money and a watch, knowing that Hassan will take the blame to protect him. Amir stands by and does nothing to stop it, thus indirectly getting both Ali and Hassan in trouble.
Hassan is Amir's half brother. Hassan's father, Ali, was like a brother to Baba so he lived with Baba. However, Baba impreganated Ali's wife and had Hassan who became good friends with Amir.
Ali and his son Hassan left Baba's household in "The Kite Runner" because they were forced to leave due to the dishonor of Hassan's biological father, which created tension and conflict in the household. Amir frames Hassan for theft to get rid of him, leading to Ali and Hassan's departure as a result of the betrayal and injustice they faced.
Actually, they are half brothers. Amir had found out that when Rahim Khan had hinted that Ali was not Hassan's father but Baba was (which explains why Baba had a closer relationship to Hassan and Amir).
Ali tells Amir that Hassan mostly runs errands and does chores for him now, as he is getting older and can no longer do physical work like he used to.
Baba shocks Amir by letting Hassan and Ali stay at the house, as Amir had put the wristwatch and Afghani bills under Hassan's mattress so that when Baba did find out about Hassan's stealing (a trait that Baba once told Amir he would never forgive in a person), Baba would want to push them out. Instead of Baba kicking them out, he forgave Hassan for "stealing" (he only admits stealing from Amir to protect him), and begs them to stay. Hassan and Ali leave the next morning and Baba weeps when they leave.
He remembers that Baba never forgot Hassan's birthday and that on one of Hassan's birthdays, Baba paid to have Hassan's harelip surgically fixed. Amir recalls when he asked Baba if they could get new servants, Baba had gotten furious and yelled at Amir. He had said Hassan and Ali are part of their family and they are not going anywhere. He also remembers that when Hassan and Ali left, Baba wept and wept.
Hassan is revealed to be Baba's son, making him Amir's half-brother. Baba had an affair with Hassan's mother, resulting in Hassan's birth. This revelation adds a new layer to the complex relationships in "The Kite Runner."
Amir asked Hassan to leave the neighborhood and move away from the household, as it would be easier for Hassan to live a peaceful life without the burden of their complicated relationship and the secrets that were kept from him.
The main characters are: Amir Hassan Baba Ali Rahim Khan Assef Soraya and the general also hope this helped!
Bullying Amir and Hassan. He hated Hazaras like Ali and Hassan and like Hitler's extermination, believed in killing them all. In the end of the book, Assef is the man at the stadium in white with the sunglasses. He "owns" Hassan's son, Sohrab and sexual abuses him. Assef fights with Amir and Sohrab shoots his eye out with a sling shot. Amir and Sohrab escape.