Cranium is a board game, supposedly for the whole family (although it does state 12+) but there are some questions/clues/tasks that will be beyond children without adult intervention...how many 12 year olds know who Billy Connelly is, for example? BUT it has to be played in teams, so as long as the teams are arranged with this in mind it shouldn't pose too much of a problem.
The thing that makes this game such fun is that it's a combination of all the old family favourites and has a bit of everything...pictionary, charades, name that tune, trivial pursuits, you even get to play with play-doh!!!
This has become a firm favourite in our family, and is usually even more fun at the end of Christmas Day after a few glasses of vino. I wouldn't recommend the vino before you play it for the first time, however, as the instructions are quite complex and can take some reading!
The only downside we found was that the play-doh/plastecine provided wasn't really enough for what you need and also dried out very quickly, so we ended up buying more especially for this game.