{Percy Jackson fans} If they do all the films will the last one get a rating of 12 or 15?

Here we have G, PG, PG-13, and R ratings so I think it would get a PG rating most likely because they will want lots of people to see the movie since the first one didn't do so good. So what I think they will probably do is make Luke stabbing himself and Ethan stabbing Annabeth just not look as bad so that they don't have do do a PG-13 or a 15 rating. So I guess in the UK it would be a 12 rating because I'm not sure what the rating before 12 would be! I hope they do make all the movies though.