Kamal's+father+commits+suicide+after+Kamal+dies+from+breathing+the+fumes+in+the+tank.

Well first off, on page 120, we are exposed to the fact that Kamal suffered a similar fate to Hassan, in that one day he was raped. His reaction to the raping reflects his character as well as guilty conscience, as he refuses to speak after the occurrence. He had delivered Hassan the same fate by aiding Assef in the brutal act, so in a sense it is ironic that it would occur to him'; this shows that in their society the idea of all bad things affecting your future and coming back around ten-fold is believed. Kamal's father commits suicide as a direct result of his son's death from the fumes on the bus. The weight of his misfortune, including his wife's sudden death, his son's raping, and his forced relocation, led him to commit suicide. It is also ironic that it was Kamal's father who said that raping was a sin, yet Kamal still participated in the act. In this novel, all sins hit the sinners head-on, which may predict Amir's misfortune in the future, as his sins have still gone unresolved.