If you are asking about what income tax form to use for your parents, you could use Form 1040 or 1040-SR.
Form 1040-SR is available as an optional alternative to using Form 1040 for taxpayers who are age 65 or older. Form 1040-SR uses the same schedules and instructions as Form 1040 does.
Form 1040-SR is an alternative to the traditional 1040 form. It that features larger print and an easy-to-read standard deduction table. Form 1040-SR can be used by seniors 65 and older filing a paper return. Other than these accommodations, it functions the same as the standard 1040 form.
If you are asking about which version of TurboTax you should use for your parents, you can start with the free online version. If they have anything that requires an upgrade TurboTax will ask if you want to add the service. Click here for TurboTax Online Free version. As xmasbaby0 mentions above, any version of the desktop download will work as well.
If your parents are below the filing limit but have withholding of income taxes, they will want to file to get that back.
Click here for "About Form 1040-SR, U.S. Tax Return for Seniors"
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