Despite being 11, Parker's a boy who needs a lot of sleep, and you find it necessary to require a 9:30 bedtime for him... He just doesn't function well on less than nine hours sleep and sometimes needs a little more, and a 9:30 bedtime gets him nine hours, plus gives him an extra thirty minutes leeway if he's real tired. There is some complaint, because he didn't have to go to bed until 10pm at his mother's house, but there wasn't too much trouble about it.
Last night, after saying good night to Parker and Van's older brothers, you hear some giggling coming from Parker and Van's room. Sticking your head in the door to tell them to quiet down and get to sleep, you see Van already crashed, but a big lump reveals Parker's doing something under the covers. After a moment, it moves around enough for you to tell there's a light under there, so you go and interrupt him.
It turns out that, at some point, Parker has liberated one of the pre-paid cell phones you keep for younger boys and emergency use, and he and his best friend, Joey, have been carrying on a text conversation.