Murder mystery birthday party?

My birthday is in October and I really want to do a murder mystery. I would like to do it similar to the Clue game. The thing is the only guys attending are my brothers and father, and I'm not sure if they will play part in it. I will also have more than just three girls so do you guys have any suggestions as to how I can make this work? Names for added characters (girls)? And how to go about this? Should it be scripted? And any other ideas for this please??? Thank you!!