Allow parents to implement DNS logging/blocking? I did this inadvertently where I used to live in a shared house at one point. Set the DNS settings of the routers DHCP to point to my pihole.

Then a few months later I realised when I looked at the logs when trying to diagnose an issue that I had logs of everyones DNS history. I needed a shower after glancing at that. Trivial to bypass if you know how to of course, but logging it instead of blocking it means you are less likely to realise at first while a block is obvious and you can go on to bypass it.