If the truth of the matter is, the parents were on a break before the kids went missing, and DM in fact did not sleep in the home Thursday night, but that he arrived i.e., around 9:30/10am to visit his daughter, what the stepdad says could be true. If he walked in and did not see the kids, he would automatically assume they were at school because it was a school day (no backpack, no boots at the back door to the yard). If he didn’t see anyone and so went to the bedroom, he would not be surprised to see her in bed “drifting in and out” with the baby in bed with her. If yes, he might have crawled into bed with them, waking her up. They could have been talking (for 20 minutes?) and then…being awake and conscience realizing she couldn’t hear the kids (silence) that’s when things would have gotten “immediate”. So, for him to say he saw Lilly before the silence (not that morning a different morning) is true. If I’m right about DM “couch surfing”, and if for example Thursday was one of the few shifts he was able to work, then his lying might be in the name of love/disbelief she could be guilty of anything “untoward”. But if he lied to protect her, (obstruction) that is a huge problem with dire consequences. JMO/MOO