You can check the visited sites from the browser if they have not setted private surfing.
The best way is to setup their Mac with 2 User account: one administrator (you) with a password only known by you and the kid's account with user priviledge and a Parental control. To change this they will need to know your password.
But I'm told my son surely knows how to "clear" the history. Even if he did that, there would still be a record or log somewhere on the computer of sites visited. But I have no idea of where or how to get to it.
I also have a Time Capsule that serves as a backup and wireless machine. Would intenet sites also be on there?
Your help is appreciated.
Don't think an "FBI" level is required here. (No one's been killed to my knowledge.)
Explored the "History" menu and didn't see anything unsual. Also, found a "Downloads" folder in the Hard Drive window. Seems like normal computer stuff to me.
Is the same true of Time Capsule? Or does that just back up things like documents, photos, music, etc? And not Internet sites?