Yeah, you have to go into a movie like this expecting it to be a theater filled with parents and children. The group behind me had two or three kids in early grade-school and during the commercials/trailers they were pretty loud. (During the movie they weren't quite as bad.) But it's really something you have to expect when going to a movie like this.
If you're annoyed by parents (which are just.... adults. So.... huh?!) and children (which I get) then go see this movie during the day on a weekday when parents are at work (again, huh?!) and children are at school. Or even a weekday afternoon or generally a time during the week when there's lest chance of, I guess, "people" being there.