If the story about Dylan being on the couch when the Father was leaving to do whatever he pre planned knowing his son would be there, Why would you leave him 'home alone' knowing you were going to be gone at least four - five hours.
Why would you have planned anything the following day knowing your son is coming to spend court ordered time with you, Why couldn't whatever was important have been done the previous week. Dylan on the couch, tv on nickelodeon, and a empty cereal bowl in/on the sink, seems if Dylan had been there from Sunday night till Monday sometime ? Dylan would have eaten more than a bowl of cereal, What did he drink, any glasses used,
From my understanding, MR is out of town for his job a lot and had just gotten back into town when Dylan was going to visit. I don't see anything suspicious about doing his errands then because he had been away from home. Dylan is 13 almost 14, it's ok for them to stay by themselves for a few hours.