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.
Amir is selfish and Hassan is humble and loyal to Amir. Hassan is a Hazara, Amir is a pashtun. Amir is granted to right to get an education, Hassan is not.
Rahim Khan tells Amir that Hassan is his half-brother and that they share the same father, Baba. He also informs Amir about the terrible events that occurred to Hassan and his wife, and asks him to come back to Afghanistan to help rescue Hassan's son, Sohrab.
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).
Hassan did not do anything to Assef. Assef was racist towards the fact the Hassan was a hazara and ended up raping him on the last day of the kite running tournament after Hassan had refused to give up the last kite which he had run for Amir.
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.
if he had not seen him come out of his wifes womb himself
Amir threw pomegranates at Hassan out of frustration and jealousy stemming from their complex relationship and his own insecurities about his father's affection for Hassan. This act was an expression of Amir's conflicting emotions and desire to hurt Hassan in the heat of the moment.
Hassan's first word being "Amir" reflects the deep bond and loyalty he feels towards Amir, his childhood friend and master. This word signifies not only his affection but also his recognition of Amir's significance in his life. Additionally, it highlights the power dynamics between them, as Hassan, being a servant, looks up to Amir, emphasizing the complexities of their relationship within the context of their social status.
In the letter that Hassan wrote to Amir in "The Kite Runner," Hassan revealed that he forgave Amir for their past misunderstandings and cherished their childhood memories together. He also informed Amir about his life in Kabul and expressed his hope to reunite with him someday.
Amir lied about Hassan stealing his birthday money out of a combination of jealousy and a desire to distance himself from Hassan, who was both his friend and servant. Amir felt pressure to conform to societal expectations and sought his father's approval, believing that accusing Hassan would elevate his status. This betrayal stemmed from Amir's internal struggles with insecurity, guilt, and a longing for acceptance, ultimately leading to a deep sense of remorse later in life.
Amir and Hassan, the sultans of Kabul
Hassan and Ali give Amir a leather-bound notebook for his birthday.