[resander]

Many thanks for responses.

When the children did their GCSEs we did not have this problem. They had to be in bed 10 in the night to get enough sleep to be in school at 8 in the morning every school day. Now they are doing the A-levels and most of the time their classes start late morning or after lunch, which means they can usually get 6-7 hours even when they surf in the middle of the night. They claim most children of their age do this using laptops, tablets or smart phones playing facebook, twitter etc for hours. That may be so, but I am against it because they are not getting good quality sleep at regular hours. I tell them to read books or do some sport, but they prefer social networking, watching movies on their laptops. I want to reduce this; the first step is stopping the late night Internet usage.

The children have used PCs and laptops for at least 6 years and know how to look for things on the Internet, installing/uninstalling Windows and Ubuntu, dual-booting etc. If I put some parental-control software on their laptops they would know how to uninstall it or just reinstall the OS, so control by software is not going to work either.

The children are 17 and 18 years and I don't think confiscating their laptops during the night is appropriate. They would just continue using their smart phones. Confiscating these too would cause daily wars and friction. They need their laptops and smart phones everyday, but not in the middle of the night.

From what I understand a router reset restores default values in the router including login and password and WIFI password so the children can easily continue surfing after pressing the router reset button and changing the wifi password on their laptops to the default.
I can physically stop a router reset by fitting a lock on the living room door or putting the router in a (bird) cage with padlock.

Idi Banashapan suggests using an additional router/modem for the wifi for the children and physically remove it and keep it in our bedroom during the night.

Q6. there is only one coax cable coming into the house and that plugs into the Superhub.
How would I connect a second router to the coax cable? and would the Superhub and the additional router be able to work in parallel without getting the data mixed up?

Ken