@Sharon88
If you don't want to go down that route (and so avoid the extra monthly cost) the DIY alternative is to add a separate wireless access point (not a second router) and then change the WiFi and administrator passwords of the Sky Hub.
The young person uses the wireless signal from the access point, which has a separate power supply and can be switched off either manually or on a timer while leaving router access for adults.
* * * * * * *
Sky Glass 55" (on ethernet) & two Stream Pucks (one ethernet / one WiFi)
BT Halo 3+ Ultrafast FTTP (500Mbs), BT Smart Hub 2
