Get your taxes done using TurboTax

Have you created the new account yet?   If you are signed into your TurboTax account, you should use the Sign Out function - from the left side menu, at the bottom of the screen.    Then on the sign-in page, select Create New Account.  You can use the same email address, you just need a new user id/password combo for your dad's return.  @mland 

If you are unsure if you created the new account yet or not, you can find all the accounts created with your email by going through the steps in this article >>  How many TurboTax Accounts do I have?