Want to join the Fifth House? This is the Form Book! All the information inside will tell you exactly what you have to do to join! :D Anyone can join as long as they have at least one house. So, this means any person in the Fifth House or in one of the other houses. If you aren't sure what house you're in, or you've never learned, there are many quizzes online that will tell you! You need to know what house/s you are in before you send in your form to join!