My other thought on this is that if your child is inteligent enough to be influenced by "unsuitable material", he/she is surely going to be able to dissable the preferences you have set in about 3 seconds flat.

The keyword filter is excellent and I use it all the time, but only to cut down the number of items that come up in searches, ..... and as I said above, lots of stuff comes up, I gather, which is totally not what it says in the title! best of luck, and don't let them watch the news please