How to set up 2 networks at home; 1 for kids and guest, and 1 as Primary

I currently have a primary network set up at home, I would like to segment it as Network A and Network B, so I am able to block social platforms, and YouTube on Network B during school hours for kids.

Currently, I have been using OpenDNS which works quite well however when I block a site or sites, it is blocked throughout the entire network, I would like to have two networks set up; 1 with OPENDNS and the primary without any restrictions. I would highly appreciate any help.

Thank you.