My sisters return with turbo tax was free. They want to charge me for two state returns

[xmasbaby0]

You are posting from online Deluxe--which is not free.  And, when you use a paid version of the online software, you pay separate fees for federal and each state return that you prepare.

How can I see my TurboTax  fees? 

  https://ttlc.intuit.com/questions/2565973-how-do-i-review-my-fees-in-turbotax-online

If your TurboTax fees are higher than expected, you can reduce them by removing add-ons     (BEFORE you e-file) :

• Remove Premium Services
• Remove MAX Defend & Restore
• Remove a state
• Remove PLUS Help & Support
• Remove Pay With Your Refund

When you chose to “start”  in the Free Edition —

Directly below the words “Free Edition” there is a blue link that says “For simple tax returns only”   If you click that link it brings up this information:

You can file with TurboTax Free Edition if you have a simple tax return.*

*A simple tax return is Form 1040 only.

Situations covered in TurboTax Free Edition include:

• W-2 income
• Limited interest and dividend income reported on a 1099-INT or 1099-DIV
• Claiming the standard deduction
• Earned Income Tax Credit (EIC)
• Child tax credits
• Student Loan Interest deduction

Situations not covered in TurboTax Free Edition include:

• Itemized deductions
• Unemployment income reported on a 1099-G
• Business or 1099-NEC income
• Stock sales
• Rental property income
• Credits, deductions and income reported on schedules 1-3

How does TurboTax make any money?

Customers with more complex tax situations will file with our paid TurboTax products that provide all the additional forms and guidance they need. We also offer additional benefits that go beyond filing your taxes, but they are optional and are not required to file simple taxes for free. We hope that, over time, as our customers with simple returns need more capabilities as their financial situations change (for example owning a home, having a child, managing investments), they have loved our products and services so much that they will choose our paid TurboTax offerings to prepare and file their returns.

Or—-Use this IRS site for other ways to file for free.  There are 8  free software versions available from the IRS Free File site

https://apps.irs.gov/app/freeFile/

[Vanessa A]

The free version is for the simple return. 

Situations covered (assuming no added tax complexity):

• W-2 income
• Interest or dividends (1099-INT/1099-DIV) that don’t require filing a Schedule B
• IRS standard deduction
• Earned Income Tax Credit (EITC)
• Child Tax Credit (CTC)
• Student loan interest deduction

Situations not covered:

• Itemized deductions claimed on Schedule A
• Unemployment income reported on a 1099-G
• Business or 1099-NEC income
• Stock sales (including crypto investments)
• Rental property income
• Credits, deductions and income reported on other forms or schedules

If you had any of the situations not covered on your return, it would require you to upgrade to Deluxe or higher.  When you upgrade, the program is no longer free and the states then have a fee to file as well. Filing multiple states will cause you to need to upgrade as it is no longer a basic simple return as there are more calculations and complexities (credit for taxes paid to another state) to be calculated than with a single state.