This, the ending paragraph, is another part of the Reuters report I disbelieve. There are two possibilities:
a. The family is keeping a close watch on their son for fear that he will, for any reason, change his mind a second time and again go out to suicide bomb.
b. The family is fully confident the boy will not try to suicide bomb again for the same reasons he started out the first time. Now they are only concerned about the boy making an attack to avenge Haitham's death.
It is obvious (although unproveable) to me that "a." above is the truth. However, Reuters chose to report something extremely close to "b." I suspect that the reason Reuters, without any supporting quote, chose "b." is because it supports the "cycle of violence" nonsense beloved of liberals.