I noticed in Greta's interview that Joran's father appears terrified. I think his fear reveals that he knows exactly what happened to Natalee and may be involved. Fox News reports he's just been arrested as I was writing this!
I noticed in the interview this morning (Thurs. 5/23) with Joran's mother, when they panned over to the father he was literally sweating from the forehead like a pig.