Chicory - As far as blocking internet it is easy to block or allow individual devices. Every device has a unique identifier called a MAC address. No matter if it is connecting wireless or by wire. Most every router has the ability to MAC filter. You simply create a list of blocked devices, allowed devices or both. Many router also have the ability to block or allow during certain hours or days. If you know or can get the user and password to the router just use a web browser and plug in the ip address of the gateway and type in your credentials. Then look for MAC Filtering. You can usually get the MAC address from the router as you will see the connected devices or look at the device itself and the MAC address will be on it somewhere. To find the MAC address on a PC just pull up a CMD prompt and type in ipconfig /all in the list that pops up look for the physical address line. It will look something like this 00-08-c0-13-a4-01. This way you can use the internet all you want and limit what you do not want accessing it. Sorry you are dealing with this. Hugs!!