Iphone major texting issues?

First problem, my dad is receiving all my incoming texts for some reason. And second when ever i text my dad, i instantly get the same message as a new sms text from my phone numbr

Classic textbook "cross line" issue… Most prevalent in family accounts

only fix is to call your wireless carrier tech support… Your account codes need rearranging.simple fix once they determine which codes are causing the issue.

Easy fix. Go into Settings > Messages > Send & Receive. Then select the phone number and email you want to receive messages at and which number or email you want to start new conversations from. Do this on each device with the same iCloud account.

Sean, "Low Level" can get the points for this, because he/she gave the right answer.
But you should really set up a totally different icloud account from your dad.
- - this exact thing happened to me during the ios7 conversion last week.
My phone and my wife's phone shared an icloud account.
Everything was fine until last week. Right after I downloaded IOS7, texts started to be seen by both phones.
So I did what "Low Level" suggested, but then went one step further, and set up a completely different icloud account for my wife's phone.