I am trying to file a return for my elderly mother and elderly aunt. Do I need to create multiple accounts?

[MoniqueLO_]

Yes. Each return requires its own unique login and must be paid for separately (if the return doesn't qualify for Free Edition). Please see this Help Article for more information. 

Please see this Help Article for instructions on how to start another return in TurboTax Online.

@woodyandmoe

[VolvoGirl]

Online is only good for one return per account. But you can use the same email address for 5 accounts.

How to start a new online return
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...

The Desktop CD/Download can do unlimited returns and efile 5 for free
https://turbotax.intuit.com/personal-taxes/cd-download

If you want to switch to the Desktop program we can tell you how, even before paying for Online.