What did the investigators tell you about Mark's polygraph? Did they tell you it was inconclusive? Did they tell you they want him to take another one?
Did the investigators tell you that they are focusing on Mark as the perpetrator in Dylan's disappearance, or is that your own conclusion or fear?
Did the investigators tell you they believe Dylan was at Mark's house?
Did the investigators tell you whether Dylan used Mark's landline? (This could be a way they determined Dylan was at Mark's house.)
Do you have plans to bring a missing person organization such as Klaas Kids onboard? They offer many services to the parents of missing children in addition to searches.
Have the investigators told you if Dylan sent other texts Sunday night besides the ones to Ryan, and the one at 9:37?
Have the investigators told you if the postal worker sighting is ruled out? Or have they told you it's unconfirmed? In other words, what term do they use to you for the sighting - "ruled out" or "unconfirmed"?
In your interview with Melissa Blasius of 9 News, you said police searched your house. Was that with or without a search warrant? When did they conduct that search?
Have police conducted a formal interview with you?
Did Mark ever physically abuse you? Did he ever physically abuse Dylan? If so, can you characterize what that abuse consisted of (hitting, punching, kicking, choking, etc. Just a one word description is fine.)