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You must pass the following test to qualify as a dependent.

1. Cannot be the qualifying child of anyone else.                             
2. Lived with you all year.
3. Gross income for the year must be less than $4,050.                           
4. You must have provided more than half of her total support during the calendar year.

https://turbotax.intuit.com/tax-tools/tax-tips/Family/Rules-for-Claiming-a-Dependent-on-Your-Tax-Ret...