Great for you, you'll have a great time in the sun once you realise that you are in a very privileged position here. About your mom, and potential stepfather, they are in a much different position as they will be totally under school control. About your Dad, if he doesn't already know about this he can't be that close to your life! I'm a dad also and we always have so many other problems that we overlook the most obvious but that's the way we are! If your dad really loves you he would want you to have this new experience, living in a totally new world, but he would want to know where you are in case he needs to rescue you! Your choice.