For purposes of determining eligibility for and the amount of benefits under this chapter for an individual who is an alien as described in section 2015(f)(2)(B) of this title , the income and resources of any person who as a sponsor of such individual’s entry into the United States executed an affidavit of support or similar agreement with respect to such individual, and the income and resources of the sponsor’s spouse if such spouse is living with the sponsor, shall be deemed to be the income and resources of such individual for a period of three years after the individual’s entry into the United States. Any such income deemed to be income of such individual shall be treated as unearned income of such individual.