I'll probably take one on the chin for this, and this is my first post ever though I am an avid fan/reader of WS and am hooked on this case, but here goes....After looking at every bit of information available to us, I agree that the GP's were in denial initially. Families fight, but when they have a common enemy, they band together. Look at brothers and sisters. So, it is my opinion that initially, the GP's felt as though KC was being crucified by law enforcement and media, up to and including Nancy G. Their instinct to protect their child and really consider a positive, non-KC explanation for Caylee's disappearance kicked in. I believe this is what lead them to make statements to try to really believe in and consider a non-KC explanation. Despite evidence to the contrary, I can understand that they could not come to grips with the fact that their own child could do this and that the worst possible outcome had happened to Caylee.
Now that Caylee has been found however, any explanations and hopes have eroded and they really have to look at the quagmire of facts and history that surround them. Their eyes, I am certain, are now wide open to the dismal truth. I think now, they have had some time to process, think back over everything that has occurred and are succombing to truth. Thus, no visits to KC during the holidays and they are agreeing to aid in the prosecution of their daughter if given immunity.
I believe the wrong-doing on the GP's part was inspired by instinct to protect their daughter, again from the 'quick draw' decision by law and media on KC's guilt. They wanted to give her the benefit of the doubt. Given that, I have no problem voting yes in the poll, I believe that now they know Caylee is gone they want to move forward, up to and including doing the right thing, even though it means KC is essentially lost to them too.
The biggest crime here is what was done to Caylee, not anything that was said by the GP's. If it means giving them immunity to improve the prosecution's case, I say give it to them. I really don't believe they were involved or 9-1-1 would never have been called, they would not have made statements about the car to several different people, and CA would not have offered up all the evidence that she did, some of which was denied by law enforcement (this still blows my mind).