Use this form to show they have adequate means of financial support and are not likely to rely on the US government for financial support. You, the sponsor (petitioner), and the joint sponsor must complete Form I-864.See tips for completing Form I-864. Petitioners who are sponsoring immediate relatives for their green cards need to complete an "Affidavit of Support" as part of the application process. In today's video we are going to be filling out form i 864 the affidavit of support form for the joint sponsor. Affidavit of Support (Form I-864): The sponsor must complete this form to demonstrate that they can financially support the immigrant. If you are filing Form I864 as the petitioning sponsor, use our How to Fill Out Affidavit of Support Form I864 guide. (A student with a sponsor in the U.S. may also need their sponsor to complete I-134 Affidavit of Support in order to apply for their student visa. This video will help you to fill out I-864 For Joint Sponsor. However, they don't need to fill out form I-864A.