Could it be that Lee is still pretending to be on Casey's side.....maybe he is afraid she will throw him under the bus. Maybe he DID have something to do with the coverup or disposal/moving of Caylee's body.
I just cant believe the family is still covering for her! How can they not see that she is the one who is causing all the pain and trouble that they are experiencing right now. I can understand being there for Casey, and still loving her, but OMG she murdered your grand daughter and lied about EVERYTHING (before, during and after the murder). This family will never be able to heal unless they quit enabling her.
A part of me wants to believe that they are HOPING she will come clean and that is the reason they are not ratting her out. They all know by now that threatening her will backfire, and if they DO tell LE what they know, she will somehow do them in too (legally,emotionally, etc)