This page contains filing locations, checklists and other resources to help you understand our forms and filing requirements. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents.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. Only a licensed attorney or accredited representative is authorized and qualified to assist you with your immigration case. It is against the law for. What Is the Purpose of This Form? This form is for applying to U.S. Citizenship and Immigration Services (USCIS) for the following travel documents: 1. Complete Part I, Items 1 – 7, with the information as it appears on the current certificate. 5. You can also get the form from the County Recorder or County Health Department in any California county. How do I complete the.