Hello, triciagrace. Welcome to the Xfinity Forums.
If you are referring to a username, it will need to be removed from your dad's account. If you are listed as an authorized user on the account then I will be able to help you get this corrected. Please send me a private message with your first and last name so I can assist.
To send a private message, click my name "ComcastTambrey", then click "send a message".