Redeem?

Does Amir ever really redeem himself? Is redemption possible for anyone? Explain. I think that Amir really isn't able to redeem from certain stuff that happened in his life. For example when he watched Hassan get raped and didn't do anything. Now he feels guilty about hat happen because now he found out that Hassan was his brother. So its like he watched his brother get raped by Assef. He would never be able to recover and move on from that because even though Hassan's dead. His still has Sohrab around him and knowing that same thing happened to him. But Amir is learning to live with it and to make things the best of it. He has to learn to redeem everything that has gone on with him. How he ruined a great friendship/brothership between him and Hassan just because he was jealous. Amir is now trying to make a good friend with his nephew because he ruined what he had with Hassan. He trying to make the best of it so that he could move on and not have to live with what he was living with. =)