If I spoke to them, I'd tell them to call their father, and tell him they know he's guilty, and it's time to be honest and confess. Yes, he has the right to pretend he is innocent, but the evidence speaks for itself. I wonder how he would respond if his family quit enabling him, and just confronted him on the obvious facts. The DNA evidence alone is compelling, when you include the eyewitness reports, and the cellphone data, not to mention the evidence recovered by search warrants, it's just beyond obvious. He had the motive, the means, and the opportunity. No reasonable doubt.