If you claim your MIL you get a $500 credit for other dependents. You do not receive a stimulus check for claiming her. (and she does not receive a stimulus check if claimed as a dependent.)
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
https://ttlc.intuit.com/community/children-dependents/help/what-does-financially-support-another-per...
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