Router wanted to config firewall

[mercygroundabyss]

@frollic

It works, but access to certain sites is blocked for all, not only devices used by the kids.

AFAIK pihole doesn't have any scheduling, so you can't switch access/rules on and off automatically.

Adguard Home would do it. Two ways to do it. opkg install on a OpenWrt router or custom install via
[How-To-Updated 2021] Installing AdGuardHome on OpenWrt

More info on AGH here

AdGuard Home | Network-wide software for any OS: Windows, macOS, Linux

Also definitely AP mode on your other router.