Think carefully before you take kids, especially sensitive ones.
This isn't really a spoiler, but Anakin kills some children. (Memo to George Lucas: OK! He's evil! We get it!) You don't see him do it, but you do see their bodies and it is discussed multiple times. I think a way bigger point of it is made than had to be and it would have freaked me out big time if I had seen it as a child.
I have much more to say about other aspects of the movie, and will likely say it in the morning.