Two phone numbers on my new phone

I got my new iPhone 15 Pro today, and I followed everything it said to do, but now I have not just my phone number associated with my phone, but also my Dad’s number (he is the account holder for our phone plan). On our Verizon phone plan, it completely deleted his current phone he still uses, and replaced it with mine, but his number is still there. I am receiving his text messages and everything, but he no longer is and we don’t know how to get rid of his information on my phone, we were just trying to switch the cellular plan from my iPhone 11 to this new one and add the eSIM to the phone and Verizon plan. Any help is appreciated.