We don't know what the boys were doing.
Even CB who is their mother and was there (part of the time at least) doesn't know because we've heard they were cleaning, sleeping, watching YouTube, watching TV, playing PS4, playing Minecraft, being on the internet, using the computer. Now, i get, you can use the computer to go on the internet to watch YouTube. So, some of these things are not mutually exclusive. And several of these things are close enough together that one thing might be as good as another to describe what they were doing. But, all day?
Stuff can be paused. Games can be saved.
They might have talked to SW or CB. CB said she watched TV with them for a while.
But, even if we throw out H saying they were at work with DW (which is a better reason for him to take the Subaru than it costs $600.00 per month), we don't know what they were doing all day possibly on their own.
CB said one said SW wanted him to play with her and he feels guilty that he didn't. DW repeated this story.
Yeah, kids can get totally involved in games and videos. But there are three of them, so one could have gotten bored and done something completely different for a while.
These are boys who live in the country and own motorbikes. They may have been told to stay in all day, but this doesn't mean they did or didn't.
Also, they didn't have a comfortable looking set up for staying in one place all day. That coupled with the amount of energy boys typically have makes me doubt the glued to the screen all day. Moo jmo jmo