Each applicant must demonstrate the intent to reside indefinitely within the State of California and in the County of Santa Clara. 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).On Form I864, petitioners must prove that they have the ability to financially support the visa applicant(s) if necessary. Our domestic partnership was established in California. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States. My residence or business address is: On (date):. I served the following documents (specify):. If you live outside the US but claim to be a US citizen, you will need to send in a written explanation and proof of your claim along with your Form I864. In this post, we'll explore examples of proof of US domicile and the documents required to establish proof of domicile. Residency Verification is a process where families provide proof that they live within the school district's boundaries.