The individual who signs the affidavit of support becomes the sponsor once the intending immigrant becomes a lawful permanent resident. 1. Talk to the person immigrating to the US. The person for whom you write an affidavit should be someone you know very well.Fill in the sponsor's full name, date of birth, and contact information. Specify the relationship to the immigrant. 11th JD - Queens Surrogate's Court Local Forms. Note: PDF reader is needed to open these forms (Adobe, Foxit, etc.). : To sponsor an immigrant, a qualifying individual must complete an affidavit of support that will be submitted to the immigration agency. Mistakes in filling out the Affidavit of Support (Form I864) or other required forms can cause delays in processing or even result in a denial.