How to change my Apple ID email?

I had an iPod and I used to use the Message app to text other people using my email as send&receive. Then when my dad and I first got our iPhones, we both used the same email(my email, because I got the phone first) address to set the phones up, and now you are probably wondering why using the same email… Well because the phone wouldn't let my dad to create his own apple account using his email, and it worked when we tried using mine and my password. So then somehow he could finally create his own apple ID using his own email later in the process and I went straight using my email(because I had an iPod and I just used the email on the iPod). Now I just noticed every time I send messages to my iPod, my dad would get the messages too. I'm very confused, and I tried to changed it in his account but I just couldn't figure it out. Can anyone help me please?

Go to iMessage settings on his iPhone and deselect your email addresses/numbers.
Go to iCloud settings on his iPhone and make sure you're logged out of your account (your email) on his phone.

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