Completing and signing Form I-864 makes you the sponsor. 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.A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. You may also need to submit Form I-134 Affidavit of Support. Form I134 is used to document the personal finances of a sponsor who lives in the United States. CitizenPath provides an affordable service to help you quickly and accurately prepare Form I134, Declaration of Financial Support, for your situation. This form is required in most familybased green card applications, including CR1 and IR1 spouse visas and some employmentbased green card applications. You must also submit an affidavit of support for your parent, referred to as the I-864 form. The person who is petitioning on behalf of the immigrant visitor fills out Form I-134. Visa application form.