who is kamal? what happend to him? and how did kamals father react?

In the novel "The Kite Runner," we are first introduced to Kamal when Assef, another boy and he are being bullies to Amir and Hassan. Hassan stands up to them and they leave saying that they will get even with the boys. Later in the novel, Kamal is one of the boys with Assef when he rapes and beats Hassan. Kamal is a Pashtun and one of the accepted class while Hassan is a Hazara. Kamal pretty much follows Assef's lead and does what Assef tells him to do.

With a twist of irony in this novel Kamal is later attacked and raped himself and eventually killed trying to escape the Soviet Russian's rule of his home country and Kabul.