The two relationships thus demonstrate — albeit unknowingly to the characters — the nature of brotherly love, a love that includes jealousy and insecurity.
Ali, Baba, the General, Hassan, Rahim Khan, and even Amir demonstrate varying degrees of paternal love, each having expectations for his child and providing physical and/or emotional support.
His plan does not work quite the way he wants it to. His plan does not work quite the way he wants it to.
Baba forgives Hassan and Ali, but they choose to leave willingly, making Amir feel even worse about what he has done.
Yet the person who speaks most poignantly about the nature of forgiveness is Rahim Khan.
In his letter, he asks Amir to forgive him for keeping Baba's secret but also writes explicitly "God will forgive." Rahim Khan is confident that God will forgive all transgressions, and he encourages Amir to do so, too.
Amir also finds redemption by adopting Sohrab and giving him a new life in America.
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That is why he still cringes every time Hassan's name is mentioned.
When Amir finds out about Baba's betrayal of Ali (and subsequent betrayal of Hassan), he realizes that everything he thought he knew and understood about his father was false. But Baba has been dead for fifteen years, and there is nothing he can do about the situation.