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If you claim that person as a dependent - that means - you provide more than half of his support and you are living in the SAME household - that is OK from tax prospective..
HOWEVER..If that is Supplemental Security income - which is based on needs - then his benefits could be affected.
So as long as he reports that support on his SSI application - you are OK.If however - that is social security income based on his working record - these will not be affected.
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