Maybe the brothers were told by Daddy VDS to take off with their car and clean it up real well, while Joran and Daddy took Natalee back home to decide what to do with her body. There was a call to the the DJ who lives in Santa Cruz at 6am in the morning...
I think that might be very close to part of the story. Which is why Daddy VDS was called. There was some problem, and even though Joran was out when he was not supposed to be, they needed Daddy VDS. I bet he was hopping mad that his son had skipped out, but if something serious had happened to Natalee, he probably immediately did what he could to cover it up.
Am I the only one who finds it beyond belief that the father would cover for his son if in fact N is dead? I couldn't do it.