Well, the show gives a PG-13 rating which probably made you nervous. It's not really that scary, but I have seen both reactions from kids. Some didn't think it was scary at all and others started crying. As for the language, it's not too bad really...not like they use cuss words...worst I remember them saying was "pissed" and they only used that once or twice...and not at every show. The jokes will fly over your kids' heads. I understod all of them, but my friend who is a couple months older than I, didn't get over half of them.
You can't miss the show next time you go! Maybe someone can watch your kids or something so you can see it. Only about 25 minutes long.