In the play by Arthur miller “All my Sons”, there is a change in Joe Keller’s way of seeing what he did during the war and the consequences, and how he takes responsibility about it, before and after reading Larry’s last letter to Ann. First, Joe changes his point of view in what he did from his shoes to the parents of the 21 men who died because of him. Before reading Larry’s letter, he was convinced that what he did was all right. “This one bothers everything. You make a deal, you overcharge two cents, and his hair falls out” this quote show how he tried to convince himself that what he did was all right by making Chris someone who blows things out of proportion instead of taking any responsibility. After reading Larry’s letter, he realizes that Larry didn’t think the way Joe did. “Every day three or four men come back and he sits there doing business…” Joe used to say that if Larry was alive hi would support him with what he did and clearly it is no that way. “Goddam, if Larry was alive he wouldn’t act like this. He understood the way the world was made. He listened to me”. This two quotes makes Keller know that his sons did not agree at all with him and that Chris was not the problem, he was. Second, Joe realizes what he had done to twenty-one families or more after reading Larry’s letter. He now thinks about the people who died in the war and their relatives. “Sure, he was my son. But I think to him that they were all my sons”. He never talk about the pilots in the play, he only talks about the business, money and the way of putting the blame to others. Joe Keller only realizes what he had really done at the end of the play. Before, he only tried to make other people believe that he had not done anything or if what he did was all right. In the end, he takes responsibility in many years, what ends in suicide from part of Joe for being afraid of going to jail.