i agree totally. the house of cards is falling, they cannot dance around the truth anymore, they have no explanations for casey's absurd web of lies....
and if i had to guess, they are being pressured by LE to come clean, help out, or face potential charges themselves (even though this is probably an empty threat). i think this would explain why they have been so "forthcoming" lately (at least in terms of calling the police back to the house, etc) and why cindy went off about not "hiding" anything...
I think LE is holding a veiled threat over the family, as well. It would not look good to hold any family members right now -- the appearance would be LE is going after people who are not the killer(s). But make no mistake about it -- if they wanted to -- LE could hold any one of them -- if not for crimes -- as material witnesses. If somebody says "I have information about a murder, but I'm not talking", in many cases, that person is held as a material witness and put before a grand jury.