I am about to file for my husband and need sample of affidavit of third parties acknowledging the marital union. Does the affidavit have to be from each person?Use our I130 affidavit sample and tips to create a strong affidavit for your spouse. Include these key points and avoid common mistakes. Much confusion surrounds the need to submit I751 affidavits and how to write them. We explain and provide an I-751 affidavit sample. Original petition (notarized) and two (2) copies. We are thinking of submitting some proof of bona fide marriage. Can anyone recommend a good witness affidavit template that we could use? The Affidavit of Support is required for all family based cases, whether it's a green card through marriage or a sibling sponsoring a sibling.