Use our I130 affidavit sample and tips to create a strong affidavit for your spouse. Include these key points and avoid common mistakes.I acknowledge this affidavit is a legally binding document. By signing this document below,I agree, pursuant to. Use the sample I751 affidavit as an example. Remember that each letter is unique and should contain elements that are personal to your story. How to fill out the Affidavit for Marriage Witness Sample Form? Click on the items to view samples of legal forms. Our office only records marriage certificates for marriage licenses that were obtained in Los Angeles County. Explain how you know the couple.