This seems pretty interesting, do you have links that provide more details on this? Is it all functionality that's available by default on pihole or did you use some mods/custom blocklists/etc?
It's stock pihole functionality, just the basic groups management feature and default blocklist. Using the stock pihole docker container. There are some helpful blog posts [1, 2] in the top google search results for this setup but honestly very easy setup. I like simple setups.
I should add that what makes it work so nicely with pihole is you can use regular expressions for the DNS allow/block lists. So the kids group has a deny rule of `.*` and those few explicit allowed sites I mentioned.
[1] https://mariushosting.com/how-to-install-pi-hole-on-your-syn... [2] https://www.wundertech.net/how-to-setup-pi-hole-on-a-synolog...