You should file your affidavit before the court date. If you are proceeding without an attorney the court will probably treat it as your response to her request. If you file that document ahead of time you must send your ex-wife a copy and let the court know that you did so by filing a proof of service. You are better off filing your document ahead of time so the judge and staff have time to read and think about it. If you wait until the hearing you will get to have your say but the court could refuse to accept a written document. That would be up to the judge. It doesn't hurt to have the document notarized.
Answered on May 07th, 2014 at 8:31 PM