MediCal is California's Medicaid program. 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).First, middle, and last name(s) of the applicant and current residence address;. You must reside in California for more than one year (366 days) before you will be eligible to be classified as a resident for tuition purposes. Typically, in order to claim US domicile, the Affidavit of Support sponsor must be residing in the United States.