Predictions on 5th Wave

I predict that Cassie will try to stop her brother from leaving on the bus with the other children.  I think that something tells her that she won't see her again if he leaves.  Cassie has no choice so she lets him go.  After he leaves the soldiers try to kill the other refugees that didn't leave.  She knows that her brother has been taken to a unsafe place.  i predict she will go after him to rescue him.  I think on the way she will meet the aliens and other refugees.  These will make her trip more complicated.  I hope she successes.