If you are not their dependent, file a 2020 Tax return.
If you were their dependent for 2020, you are not eligible whether they claim you or not.
According to the IRS:
"Economic Impact Payments were based on your 2018 or 2019 tax year information. The Recovery Rebate Credit is similar except that the eligibility and the amount are based on 2020 information you include on your 2020 tax return."
IRS FAQs
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