Well ok there are a variety of issues going on. I assumed it was 'step' relative inorder to stop it being incest, and that it's basically a wink to the audienc

Well ok there are a variety of issues going on. I assumed it was 'step' relative inorder to stop it being incest, and that it's basically a wink to the audience without changing the 'script'. Personally I don't think changing the title is morally relevant so it doesn't matter to me what precise relation the script and title uses. Which takes us back to depiction, they're all actors so what ever the laws are, it doesn't matter. Or shouldn't.