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You may be able to claim your grandmother as a Qualifying Relative dependent if:

  • You provided more than half of her support in 2016
  • She earned less than $4,050 in gross taxable income. (Social Security income generally doesn’t count here.)
  •  She lives with you 365 days in the year or is related to you. 32
  •  She isn’t a dependent on someone else’s tax return.
  • She isn’t filing a tax return with a spouse (married filing jointly).
  • She  is a U.S. citizen, resident alien, national, or a Canadian or Mexican resident

You can’t claim a dependent if you are a dependent on someone else’s taxes

See Rules For Claiming Dependents

Your claiming her as your dependent may affect Supplemental Security Income (SSI) , but not Social Security income.