One of the things I remember is that very early in the case, Drew's mother was very vocal in her defense of him. Then she dropped out of sight. Drew's mother and step-father were subpoenaed to testify before the grand jury and at that time Drew made a nasty remark about his mother........something along the lines of "I don't know why they want to have her testify, she's senile."
I've wondered if there's been some sort of falling out between Drew and his mother?
Also, Drew's brother, Paul, was at the Peterson home constantly in the first month or so, and then he too seemed to drop out of the picture.