If you did not mark on your tax return that you can be claimed as a dependent by someone else and you have already e-filed your return, then your parents cannot e-file their tax return and claim you as a dependent. They would have to file by mail to claim you as a dependent.
As for you, you need to amend your own tax return and indicate that you can be claimed as a dependent by someone else.
Please see this TurboTax FAQ for instructions on how to amend your tax return in TurboTax.
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