I can't emphasize it enough, do *NOT* get this movie for the kids.
For that matter, you'd best spare the adults from it as well.
All right, perhaps I'm overexaggerating a little. This isn't the worst kids' movie... no, let me rephrase that. This isn't the worst movie made by dissilusioned adults FOR dissilusioned adults and somehow marketed towards kids (that would be "Jack", which I've been meaning to review / gut like a fish).
Adults won't learn anything surprising (well, if you must, fast-forward to just before the end credits for a Educational Bit about an Interesting Cosmic Phenominon). We don't usually end up doing as adults what we wanted to do as kids as reality tends to get in the way. Well, duh, I could have told you that (so can four years of college at an art school, but I degress).
I have no idea what the heck kids could possibly get out of this movie. Most likely it will only upset them (we get to watch the moment when Russ was traumatized at eight years old). There's a better movie, "Kiki's Delivery Service", that has essentially the same message but handles it litely instead of drilling it into your head. And the adults will like it too!
By the way, there is a moment in the movie made with amature MST3K-ers in mind, if they think of that OTHER Bruce Willis movie with a sad little kid in it.