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. In today's video we are going to be filling out form i 864 the affidavit of support form for the joint sponsor. In this guide, we will explain who needs to complete Form I864, when to file it, and how to fill out Form I864 stepbystep. The purpose of the Affidavit is to assist consular officers in determining whether a visa applicant will have adequate means of financial support in the US. If you are filing as a joint sponsor, then you will need a separate Form I-864 for each sponsor. Form I-864 is required for most family-based immigrants and some employment-based immigrants to show that they have adequate means of financial support. This video will help you to fill out I-864 For Joint Sponsor. This person can be a friend or family member.