I cannot believe the 2nd theory. The parents are not looking sad atall. Neither the father or mother is seen crying or show any kind of loss of child on face. Instead they are trying to hide something.. which can be easily identified. They know that the world is pointing finger towards them.. but its never seen that they are revolting against this allegation.. instead they seem to be more of defensive or cover-up body language.
Apart from everything there is something called Gut feeling or sixth sence.... and i am sure everyones gut-feel and sixth sense says that the parents are involved or AT LEAST THEY KNOW EVERYTHING (the murderer, motive etc)
