My coworker asked me if there's any tools that help him monitor and block the sites that his son is going to. The son has a laptop, so my coworker doesn't want to violate his privacy. All home systems are going through a router. So he was asking that are there any way that he can set up his PC to be the server that control in/out traffic as far as blocking certain websites that the son can access without touching the son's computer?

Thanks a lot