I would suggest watching it first unless your kids can handle the things related to in this review. The movie has a "support your family" kind of message, but other than that, there really isn't much of a message there. The comedy is there and there is still the funny Christopher Lloyd as the humorous Uncle Fester. We also see the funny woman Joan Cusack as Debbie, the woman admired by Uncle Fester. The rest of the cast returns as their respective film counterparts, some new characters are introduced, including David Krumholtz as Joel Glicker, Wednesday and Pugsley's new friend at summer camp. Aside from the dark comedy violence, mild language, a couple light scenes of drinking and smoking, and some mild kissing scenes, this film should be appropriate for ages 13 and up. Just my advice.
Fixit's Side Note - Personally I loved it, which is why I gave it 5 stars.
Just a little bit of advice for the families out there... - Fixit