Baba and Amir: foil characters?

While reading The Kite Runner by Khaled Hosseini, many parts of the story seem to set up Amir and his father Baba as foil characters.  While I'm not quite sure if they are, they certainly differ greatly in their behaviors and opinions.  First, Baba is very successful   As a child, he was very successful, winning at everything and working his way to the top of the social ladder.  We also know that he loves to throw big parties.  Amir, on the other hand, is shy and is not popular at all.  In fact, he is often picked on by other kids.  Baba loves sports while Amir has no interest in them whatsoever.  Amir is a pushover, while Baba is very set and strong in his beliefs.  For instance, he refuses to receive welfare in America saying "In Afghanistan I work, in America I work.  Thank you very much Mrs. Dobbins, but I don't like it free money (p 129)." At many times in America, Amir and Baba see things differently, like when Baba refuses chemotherapy.  In the end, however, they are happy with each other, and I think Baba becomes a role model for Amir.