There is a product I use to use that has some sites pre blocked and features that allow you to restrict access, like turning the internet on and off at certian times. iProtectYou
As far as baby sitting the kids, that is just the choice I made. It just depend how important it is to block the sites. I don't sit and wait for them to pull up sites for me to look at. If there is a site they want to see, they write it down and I review it. I make the changes remotely from my computer, via RealVNC
. I can view their computer and take control remotely if I see something I down like. We all have our own computer, 13 total. The use is a privilege not a right. They go against my rule the privilege is revoked.
Mine is only one way, not right or wrong just my way.
You should also configure his user setting so he cannot download programs. I can't go into how but there are programs that can defeat any security that you can put on a pc.