My iMessages send to everyone in my family?

My family has 4 iDevices on one account. My mom with iPhone 4, dad and I with the same. Then we have an iPad. Sometimes I get emails through my texts that should go to my dad, sometimes I get his texts. My mom and dad both also sometimes get my texts. And my dad gets my mom's sometimes. Why is this and how can I fix it? I don't want their messages and they don't want mine.

Also, we don't even need to be able to text on the iPad. This all started when we got the iPad as well.

Simple, create three different accounts.
How to change accounts:
https://discussions.apple.com/...0&tstart=0

That is because you are using the same email. Make one each

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