How do I fix messages on my iPhone/ Mac?

My Dad has a MacBook and I have an iPhone, and all my messages are going to my phone, but also my Dad's computer. How do I stop the messages going to my Dad's computer?

Check if you guys are hooked up to the same iTunes account the same thing happened to me with the new update except it was the windows and not mac book when I logged out of the iTunes account that was hooked up to my computer the problem stopped so although it's irritating to log out/in every time I use iTunes the problem stopped so I would try that.

You are most probably sharing an Apple ID. Get your own.