Internet Safety Doing

I talked to my brother and sister (14 and 12) about internet safety. They didn't seem to keen on talking about it. I asked what they should do to be safe on the internet and their response was don't be stupid. Further questioning revealed that the do know the basics and what could happen if they don't follow the guidelines. They are both smart kids and I don't really worry about them. They both told me they have never been in a chat room, but I do know that on some online games they play with others, they (my brother) do talk. They know not to share their names or personal info. I hope they will be able to give their peers good advice.