you are indeed correct, i had it wrong... none the less these kids were nowhere near 12 and whilst the movie wasn't massively scary, i wouldnt have said it was suitable for the age they were acting like. the parent just let them dick about and have their phones out and stuff so i guess regardless of age the parent should have sorted them out.
I finally saw it and you're comments about the story plot points were completely corrects. My buddy listed them off like he was reading a list as we were leaving.