On page 169, Oskar finally vocalizes the fact that his father is dead.  He also seems to release a lot of pent up anger upon his mother.  For the majority of the book, I wasn't sure whether or not Oskar truly believed his father was dead, but now it seems clear that he does.  How does this fact effect his reason for doing  search?  What are the mother's beliefs on both death and the search?  If Oskar and his mother cannot agree on what happened to the father, then will they grow further apart as the story continues?