Your question regarding Damon wanting them to "dust for prints" on the windowsill, is a good one. It all plays to Damon deflecting the crime off of them, as in every alibi he used for not being aware of an intruder that he says took Danielle. More smoke and mirrors.
Your other questions have been addressed and answered in previous threads, some pulled. Their answers are vague and make no sense.
But the best point you brought out, was Brenda's defensive attitude when questioned by Feldman. Damon displayed the same chip on his shoulder attitude.
It is said, that Feldman has reduced grown cops to tears, with his strong arm questioning.
The van Dams are going to be like taking candy from a baby, for Feldman, if they are not telling the truth. And I don't think they are.
sw
s.w., what do you think the reason for the lying might be? Do you think, as I do, that perhaps the parents are more involved in what happened to Danielle than anyone wants to think, could it be that they're so ignorant they don't realize that by lying they endanger their case against DW if he was solely responsible, or could it be that they're hiding something even worse than what we can imagine?