You should not update the personal info to file for another person.
If you are using TurboTax Online, you cannot prepare and file a tax return for another person using an existing TurboTax account. You'll need to create a new account, distinct from the account you used to file the first return.
If you are using TurboTax Desktop, you can start a new return by clicking on Start a new return on the Welcome page of TurboTax.
Please read this TurboTax Help topic on how to start a new tax return for another person.
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