My parents were a lot like the Anthony's. Whenever a family member would do something wrong, even if they knew in the back of their minds that something was not right, they would defend this family member to the end. This person stole, they lied, they pinned crimes on other people. But my parents still defended this person. When this person used my information and obtained a traffic ticket and I lost my license over it, they wanted to pay the ticket and whatever to reinstate my license and defend the person who ruined my driving record. They were honestly ticked off when I went to the police and signed a warrant. I had good reason to prove I was not even on the road that day--I was giving birth to a child. They were mad at me and refused to talk to me for a while.
I maintain that they are not defending KC. They all along have been defending LA. I don't think they knew where Caylee was, but knew something was really amiss and that Lee was involved. I think LA helped KC hide evidence, not the grandparents. The 911 call from CA is telling as far as their fears were. I think they have known all along Caylee was gone (just wanting to believe KC, so still looking for her alive, because who wants to believe that their granddaughter is dead), but sometime in Oct/Nov, realized that Lee was involved in the hiding of evidence. And I think that initially, they hid evidence/destroyed evidence on KC's orders with only KC knowing what they were doing and why they were doing it. I don't think, however, that the A's are trying to defend KC. I think they are trying to defend Lee.