It's too bad, but I have to say it:
The only "evidence" in hand as of yet:
"The van der Sweat"
Indication of complicity, -or-
A Father's natural reaction?
Sure seems the former to me.
Ultimately, all that sweat proves nothing.
But when Nat's Mom said she "saw" enough -while in the VDS household, -that- is what she was referring to.
NO ONE sweats like that unless they are afraid of something. Ask any police officer or detective who deals with criminals. That is one of the first signs of someone lying. They are pouring sweat just like PVDS. I have seen it myself. It's not a little sweat, it's pouring especially from the face and head. If his wife had to get him towels to wipe it up that is very telling.