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joint sponsorA person who accepts legal responsibility for supporting an immigrant with an I-864 Affidavit of Support along with the sponsor. The joint sponsor must be at least 18 years of age, an American citizen or lawful permanent resident and have a domicile in the United States. The joint sponsor and his/her household must have the 125 percent income requirement by itself for the immigrant that he/she sponsors.
Source: Department of State. March 2007.