An affidavit of marriage is a legal document and a sworn statement submitted to the court or another institution, to verify that two people are married. An affidavit is more than just a legal document; it's a sworn statement that holds significant weight in the eyes of the law.An affidavit is the written equivalent of verballygiven court testimony. It is a document that you swear that this person who is reading this name and the person who is reading this name they are one person. An affidavit of marriage is a legally binding document that proves a legal marriage exists between two people. This Affidavit is a form document and it is a breakdown of your gross monthly income; your net monthly income; your monthly expenses; your property. During the divorce process, each party is required to disclose the following: their income, expenses, assets, debts and other financialrelated items.