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Do you provide any support for him?
If his care is provided by a government agency, you do not meet the support test that decides whether or not you can claim someone as a dependent.
Let me know if you still have questions.
Social Security Income is not taxable income so the amount is not counted as taxable income when you file your return. Since it is not taxable as coming in, it cannot be used as a deduction going out.
If SSI is the only income that your parents have, your mother is not required to file a return.
Let me know if you still don't understand.