This is in Chapter 2.
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Amir tells of a picture of his father holding him as a baby "looking tired and grim" but although Amir's Baba is the one holding him, Amir is holding on to Rahim Khan's ( his father's best friend) finger. This shows that the distancing between father and son began at birth.
The Kite Runner
I think Amir really didn't have a father figure in Baba. Amir was much more comfertable with Rahim Khan in a father sort of roll.