When this was on Hearme, we handled it on an as-needed basis.

When kids were present, we always knew it-- and behaved accordingly in song and text chat. They were offspring of Mudcatters, with parents present, as far as I know, and they SANG!

Beyond that, if a young person wanders in, it's not our fault if they hear something bawdy-- it's that their parental beings have failed to monitor or filter the computer's use, properly. In your intro copy, you can ask that under-18's signing in let you know they are present, but I don't think you can really control what material people will be doing.

Another approach would be to offer occasional "family sings" in the room, and just specify that the occasion will be such.

Fun being in charge, eh? *G* Can't please ANYONE! *G*

~Susan