Why does my iPhone send iMessages to myself?

Ever since i updated my iPhone 4 to the new software I have been recieving my own texts when I attempt to text my dad. I also receive some of his texts from other people. It seems like apple linked our accounts somehow but I don't know how to separate them. We use the same apple ID but it's been that way for over a year now with no problems until now. Any help Is appreciated.

Make your own Apple ID, make your dad's own Apple ID: P
Then or before doing so, try changing the Apple ID and make sure they're different in both iPhones by going to Settings then Messages then Send & Receive. If you see the same Apple ID on both phones in the Send & Receive, you have to put a new Apple ID in one of the phones.
And if you made a new Apple ID for yourself or your dad, don't forget to add it to the contact!

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