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. Petitioners who are sponsoring immediate relatives for their green cards need to complete an "Affidavit of Support" as part of the application process.This Guide has been prepared for the purpose of providing general instructions for completing the Form I864, Affidavit of Support. This article will review those legal requirements, the six situations that terminate the affidavit of support, and the legal rights of the sponsored immigrant. Complete this form to provide the Domestic Relations Section with information for yourself, your children, and the other party to the support action. You through filling out the blank form. 1. I have listed my wife as the principal immigrant in Part 2. And my step daughter as Familiy Member 1 in Part 3. You will need to fill out the following forms from this packet. Filling out an Affidavit of Service (Video); Video; More Information and Forms - Representing Yourself: Custody Proceedings (PA Courts); Related.