There is no residency requirement for 1-day designations. An affidavit is a sworn statement of fact that can be used in a variety of legal proceedings, from bankruptcy cases to family and civil litigation matters.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. Find definitions for specific words, phrases, and terminology used in the Massachusetts Court System. If an affidavit works, that is just a sworn statement. An affidavit of marriage is a legally binding document that proves a legal marriage exists between two people. I have lived in Massachusetts my entire life and I have never been married. Common Law Marriage, Massachusetts does not recognize common law marriage, that is a marriage arising out of a couple's cohabitation in Massachusetts.