This is why it's usually helpful to separate prospective students from their parents (and from their boy/girlfriends, come to that): some of them will ask questions for themselves if their parents aren't in the room. When I took my daughters to open days I made sure to stay as far away from them as possible, and they both managed to ask question, which neither of them would have been likely to do if I'd been hovering beside them.
Yes, yes, yes!
I wish parents would push their DC into the room, then go - having rehearsed some questions with your DC beforehand.
Most of us staffing Department stands on Open Days are used to shy kids - I have a spiel I can do which covers a whole lot of stuff that I've found (over 30 years of doing this) that prospective undergrads might want to know about.
Structure of the degree programme
How we assess (no unseen exams in our case!)
What sort of lab/practical work they'll do
What specialist areas within the broad discipline do we teach
What kinds of teaching - seminars, lectures, practicals etc
Options for year abroad
Nightlife (I usually laugh & refer them to our lovely lovely students - I'm not supposed to know about the nightclubs ...)
Extra-curricular activities
The reason the Open Day rooms are over-crowded, noisy & hot (I generally lose my voice after doing a morning or afternoon) is partly because some parents insist on doing the talking.
And both student ambassadors & staff are in a bind - we can't be rude and request parents stop talking or leave the room, so we can focus on the prospective applicants, so it can look as though we are deliberately paying attention to the parents. We're being polite, but we'd rather talk to prospective applicants on their own.
If you leave your DC to talk to us, then debrief afterwards, and your DC doesn't ask what you think is a crucial question you can always come back.
Also re websites
Yes, the front site for UCAS applicants is a marketing job. But if you dig around in most university websites, you can get to the working web pages for the discipline/department your DC is interested in.
Really have a good look at those. Some material with be password protected, but you'll be pleasantly surprised with some universities at how much working information is openly available. You can often find curriculum documents, working information pages we academics use to communicate with students, and so on.
It's also a good idea to look at the websites of the Student Union or Guild, and the sports centre (if that's what your DC is interested in). Loads of working information, not very much touched by marketing colleagues.