If not submitted to NVC along with the Affidavit of Support form, the petitioner will need to provide the visa applicant with evidence of his or her domicile. On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary.If you want to sponsor someone for a family-based green card, you need to provide proof of a U.S. domicile in your Affidavit of Support (Form I-864). U.S. citizens and green card holders sponsoring family members must present proof of domicile according to the National Visa Center (NVC). To complete Form I864, the petitioner must meet certain requirements. But what does "country of domicile" mean? The lawyers said they file I864A only in the case we need to combine income from both people on the joint tax filing. How to fill out Form I130A. Form I-751 checklist.