Originally Posted by
gfunkdave
Perhaps an offline solution is in order? "If I catch you watching Youtube when you're supposed to be studying, I take your cell phone for the rest of the day" kind of thing...
He need the computer to do some of his school assignments. In his case, he also learn math a lot better with khan academy.
FWIW, I found some solution. OSX parental control still have lots of bugs. I finally able to block youtube on Safari, but not on Chrome or firefox, eventhough osx parental control block other websites on chrome & firefox. Thus, I block his access to other internet browser except safari. I still have to put some weird ip address on my whitelist even when I have put the website address on my whitelist.