Yes, you can file your family member's taxes on TurboTax. You will need to create a new account for everyone and report their information under their own new account.
See
instructions
1. Sign
out of your own TurboTax online account.
2. Select the TurboTax Online product you want to use for the second
return and proceed.
3. On
the Create your account screen, set up a new login for the
second return.
4. You can reuse your email address if
you want to receive e-file notifications for the second return.
5. Up to 5 accounts can be tied to the
same email address
6. After
you've created the new account, you can start working on the second return.
7. Repeat the same steps for the third and fourth returns
Tip: If you're preparing
multiple returns for family members, it's more economical to switch to the
TurboTax CD/Download software, which lets you e-file up to 5 federal returns at
no additional cost. More info