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).The following list includes common documents which may be used along with the MC 214 to verify a client's statement of California residency. Petitioner lives in (specify):. Respondent lives in (specify): c. In this post, we'll explore examples of proof of US domicile and the documents required to establish proof of domicile. A minimum of three documents will be required. Category A - One (1) Required, Category B - Two (2) Required, Category C - Three (3) Required. My residence or business address is: On (date):. I served the following documents (specify):.