Want to do my aunts taxes also on same computer as mine, Do I need to pay for another package

Please see the TurboTax FAQ below for assistance with filing multiple returns:

https://ttlc.intuit.com/community/choosing-a-product/help/can-i-file-multiple-returns-with-turbotax/00/26737

Are you using the Desktop CD/Download program or the Online web version?

Online is only good for 1 return per account.  But you can use the same email address for 5 accounts.   How to start another return in the Online version

https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-online/00/25596

The Desktop CD/Download program can do unlimited returns.

Thats why if you need to do more than 1 return we recommend you buy the Desktop CD/Download program.  It can do unlimited returns and efile 5 for free.  And you can buy a lower version.  All the Desktop programs have the same forms. You just get more help and guidance in the higher versions.  Buy the Desktop program in stores or directly from Turbo Tax here

https://turbotax.intuit.com/personal-taxes/cd-download/

Or if you have the Desktop CD/Download program installed on your computer you can do multiple returns.  Go up to File-New.