They routinely checked in with their daughter and asked about their grandaughter for the first month she was missing. They were only clued into to the fact that something was amiss when they were called about their car being towed, the car their daughter had been using. They went to retreive it and said they smell decomposition, g-dad is ex-lawenforcement, g-mom is a nurse, so they would know that smell. Grandma then hunted down their daughter, calling friends and driving all over until they found her. She demanded to see her grandaugher and said she would drive to the babysitter’s house to get her, where mom said she was. At that point, daughter admitted that baby was “kiddnapped” Mom called 911 and mentioned the decomp smell.
Since then, they have defended their daughter, I think to avoid the reality that their granddauther was dead. Now that it’s staring them in the face, they might change their tune.
I concur with your summary to this point, but I would add that their "defending of her" borders on obstruction. They spoiled that brat and then covered up for her when they came to the conclusion that she had murdered her own child.
Until some point, they didnt know who had driven that car, or whether or not there had nbeen a babysitter, etc. But only a dolt would miss the truth at this point in time.. IMO.
I don't just ask about my grandchildren, I ask to speak to them. I rarely speak to my son or daughter-in-law without asking to speak to the children. So I find it odd that the grandparents would only inquire about their granddaughter, but that's just me.