Its not against the law to bring a child to an R-rated movie, if thats what you're saying. an R rating means that anyone under 17 must be accompanied by an adult to see the movie. Also, im hoping to go see this movie in the next week, and reading all this just makes me more excited about it.
He was wondering what the level of violence/sex was so that he could personally decide whether or not his kid could go. He wasn't asking if he could break the law. What the hell is your problem dude? No one needs your preachy bullshit. It's not even illegal to take a child to an R movie, just an NC-17.