jujueye

I would stick with this. Routers can be configured pretty well, just make sure you password protect the admin account on it as well. This solution costs you no extra money and does not require you to perform hardware duties every damn time you head in to work. Turning off network access with the router is good. Also, most routers can create log files to log the traffic. Turn on logging, leave the machine on one night, and find out what they are doing. However, since it is a family business, I suppose there woudl not be much you could do. Still, if they are surfing porn, it would be great to share with the rest of the family. Humility could slow their efforts. Once you know where they are going, shut down the router again.