We only have the kid's word that the father is innocent this time. A kid doesn't usually have the wherewithal to hide a package inside a sheetrocked wall inside the house without the parents knowing.
True, but I don't think his father is a significant character. But then with this show you never know- two seasons from now he'll probably be back to avenge his son's death ;-)
No, the father was originally supposed to deliver the package. When Fayed called Achmed, he told him he had to take his fathers place.