Yes, if you amend your income tax return, you'll have to pay back the stimulus money you received since you were a dependent on your parents income tax return and they got stimulus money for you.
Per IRS: You are not eligible for a stimulus payment if you may be claimed as a dependent on another taxpayer’s return (for example, a child or student who may be claimed on a parent’s return or a dependent parent who may be claimed on an adult child’s return).
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