I also noticed that daddy sloot was sweating profusely during the Greta interview. Someone said on an earlier post that it sure was convenient that the telephone rang and daddy sloot took the opportunity to leave the interview altogether.
He was obviously very uncomfortable and nervous. His body language spelled "guilty" if you ask me. I doubt daddy sloot has even told his wife the truth, but he definitely has crucial information involving his son, and may have helped get rid of Natalee (dead or alive). If not, and he's innocent, Joran will start talking to protect his dad, IMO.
that's him for sure
If I remember correctly the phone rang both times that Greta was there.