A properly completed, notarized general affidavit form can be useful in legal proceedings. Here's how to make sure your affidavit is valid in Texas.General Affidavits are written statements of fact used to support your case or verify facts that are sworn to be true in front of a notary public. My social security number is _____-______-____. If you do not have a Social Security Number, you must complete a Social Security Affidavit form available at the Texas Department of Public Safety office.