I am sponsoring the following family members immigrating at the same time or within six months of the principal immigrant named in Part 3. 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.Line-by-line guidance for properly filling out USCIS's I-864 Affidavit of Support to sponsor an immigrating family member. There is what is known as I 864- affidavit of support. This is not mandatory, in the case of F1 sponsors. An Affidavit of Support is US Immigration Form I-864. I have my Visa interview scheduled in 4 days. I was going through the required documents. The UT Dallas Financial Affidavit Form; Supplemental financial support documents, if applicable. 1 students may not work offcampus in the U.S. without first obtaining official authorization.