We are currently using 2 x Ubiquiti unifi access points on a Synology NAS controller.
Wi-Fi covers the whole house but we need more Parental Controls, it would be good to limit online time by device/groups, have bedtimes, etc.. We also need a Guest network for our Airbnb unit.

A quick search says Orbi’s are very good but it looks like they charge a subscription for their better parental controls. There is also lots of versions of Orbi with big price ranges.
Google Wi-Fi was another option I’m trying to research.

Can anyone recommend a good solution? Preferably under $600

Edit: we have cat6 everywhere, and use Alexa for most things.