IMO based on their actions since evidence of the hair banding in KC's trunk, I believe they knew but were and are determined not to lose their daughter too. They cant get little Caylee back so now they have to put that behind them and support KC however they can. After all, if KC is locked up, how could they ever get another beautiful little granddaughter from KC? If they really believed her innocent, they would have made contact with her at jail and said to hell with the recordings. they know and now will just sit back and trust in the dream team to get daughter off then spend the rest of their lives trying to convince the public that their KC was victimized and villified unfairly. bottom line they save their child. The real battle will be at home between GA and CA as they struggle with this choice. CA will either win out and Ga quietly follows or they go splitsville over it, blame it on stress of case but still support KC.
CA had to believe KC was innocent, it was the only hope she had of getting Caylee back alive. This was not a conscience choice on her part, it was her heart getting in the way of every single thing her brain saw and wanted to accept. This, I believe is why CA has appeared so combative, she has been fighting an unholy war between her heart and her brain. Look at the pix and the vids of Caylee, this is the baby she has been living for, for almost 3 years. She has been kissing her boo boos, snuggling her after her bath, feeding, playing with and loving with her every breath. Her heart could not accept this was all gone, never to return, at the hands of her daughter.
To be honest, if I were in their shoes and given a choice I would have done everything in my power to keep that baby alive too. I can't imagine behaving like CA has for 5 mos, but I also can't imagine waking up to the nightmare the A's have been living.
I believe the last of KC's lies to her family died when they received the final report from Dr. G. They had tried so hard to believe their daughter, no matter how ridiculous she sounded, no matter how ridiculous they sounded. With Little Caylee lost to them forever, I'm sure they plotted out the plausibility of any and all possible scenarios from KC's changing stories, none of them give any doubt of KC's culpability, or really even leave room for an accessory at the time of the crime. All this, the A's must now know.
Given the enormous amount of energy they have spent on keeping Caylee alive for 5 mos, I can see where they have no energy left to deal with KC right now. They know that she is safe, they know she trusts JB. As parents there is nothing more they can give her. KC's deceit has worn them down, the loss of Caylee has used whatever reserves they were running on. Confronting KC at this time would be counter productive to her defense. Preventing a meeting with his client is the only wise decision I've seen from JB in mos.
Regardless of how they feel in private isn't it their job as KC's parents to support her in public? Get her through the trial, have their last good bye and then begin trying to rebuild their lives? I hope I would have the strength to do this one last thing for my child. It doesn't have to involve public statements, the purpose (misguided as they were) of the cameo's was to keep Caylee's picture public, the rest of this can be handled through their very competent lawyer. If the public stops hanging on every single word out of their mouths, the A's could return to relative obscurity. I don't see this happening any time soon.
I know we all saw CA tossing everyone KC ever met under the bus, this was her feeble attempt to make sense of something her brain knew made no sense, fortunately LE was one step ahead of this the whole time. Apparently for all her faults KC was able to maintain "friendships" with 3 distinct groups of people who all passed muster by LE, none at this time have even been a POI in Caylee's disappearance.
In all the horror of the kidnapping nanny with an interesting name, KC, by chance or by choice never implicated a real person as the nanny. The real ZG who doesn't even have the same middle name as "the nanny" shares no similarity in looks, age, marital status, children or even in the make and model of the car she drives. KC was very explicit in her description. This was another interesting twist in the story KC manufactured.