This is a decent site for the young ones. It has never been a problem with my younger siblings who are using the web via my personal system. As usual, just make sure to set up separate profiles for the little ones if ever they are to use your compy.
This is a fun site to play on. I am a huge fan of Ben 10 so I go on cartoon network every week or so. The only thing that bothers me a little is Naruto and Total Drama Island. Naruto does contain some suggestive content in the tv show so I would check out the games first. And Total Drama Island has drug use on the tv show. So I would be careful with the games that you let your kids play. Otherwise, the old classics are fine to play.