Look into an office grade router. Something like a Sonicwall TZ 105 would do - it's relatively "cheap". You can setup username / password authentication so you

Look into an office grade router. Something like a Sonicwall TZ 105 would do - it's relatively "cheap". You can setup username / password authentication so you know who was using the network; set network availability times and restrict adult content. Add in MAC address restrictions so new devices can't come on to your network without you knowing (child's friends) - there might even be a way to restrict a username to a specific device (haven't used one in about a year) I've installed a TZ 105 in a small office (10-20 employees) and the bigger NSA 3500 in an office of hundreds - both are configured similarly.