If your MIL has less than $4700 of income -- not including any Social Security -- and you are paying over half of her support, you may be able to claim her as a qualified relative. You will get the $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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