Affidavit a written statement in which the facts stated are sworn or affirmed to be true. The only way you can fix a mistake in that affidavit or add additional information to it is to make a new affidavit.1) Complete only the upper half of the affidavit. This affidavit will be linked to the original birth certificate thus becoming part of the birth record. Family Law Financial Affidavit. Form Number 12.902(c). An affidavit is a sworn statement that is documented in writing. Affidavits are usually utilized in court proceedings or in negotiations. You should file an amended financial affidavit in the event your financial situation has changed or in the event you discover that you made an error. Such an arrangement would require the party to complete discovery before filing the motion and seeking a date for a court hearing.