One of the things I try really hard not to do (and it's nearly impossible, to be honest) is to interject my family dynamic into cases I read here. For example, in my family, one of our adult kids had to stay with us temporarily last fall and when she was here she just wanted a night out with friends. I didn't even have to ask her where she'd be or who she'd be with, she volunteered that info herself. But even if she hadn't (and all the kids do that, because they know I'm a stickler for details so I don't worry myself to death) I would have asked. Who, where do they live, number, etc. I don't ask for a phone number so much anymore since all my kids (adults and minors) have their own and I can always contact them that way no matter where they are. Even my oldest adult daughter who is 32 and travels quite a bit for both business and pleasure, always tells me when she's landed, crossed the border, checked into her hotel, etc. It's just the way our family is, this sort of checking into Home Base (mom)
Point is, I know there are tons of families that don't operate this way. Parents don't ask questions, kids don't volunteer info, and everyone just does whatever and no one thinks anything of it. Frankly, I think this is a horrible idea and many many case conclusions here have proven exactly why. It's not like you need to grill your kids, but just ask for a who/where/when & get on with your day.
MOO.