Problem with text messages on the iphone?

This started to occur after I downloaded ios 6. Okay for some reason when my dad sends a text, it says that he sent it, but also I sent it too. For example, if he asks, "where are you?" my phone says two people sent it, him and myself. Also, when people text him, I get the texts as well. It shows the conversations between him and other people as if I was the one who sent them. It's like our numbers are linked or something. Does anyone know how to fix this?

This is a common problem when upgrading to iOS 6. What you need to do is go into the Settings app, Messages >> Receive At >> then remove from "You can be reached for messages at" everything but your mail address and your phone number. Have your father do the same for his phone.

I've been having the same problem, and after contacting Apple they said they are aware but we have to wait for an update.iOS6 has too many bugs, informally.