TurboTax online products only allow for the creation of one tax return per account (username and password combination). You may have up to five accounts associated with a single email address.
To begin a tax return for another family member, create a new account or log back into that family member's account from last year. IF upgrades are required, fees must be paid on each account.
TurboTax CD/download products allow for the preparation of up to five tax returns on your own computer.