If you had over $4200 of income from any source other than Social Security in 2019, you cannot be claimed as anyone else's dependent. And...if anyone claims you as a dependent you cannot receive the $1200 stimulus check.
If your sister claims you all she gets is a $500 credit for other dependents.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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