The court must strike an unsigned paper unless the omission is promptly corrected after being called to the attorney's or party's attention. This packet provides general guidance about writing a motion.You should file the motion in the same court where you filed your divorce petition. You may need to pay a filing fee when you submit the motion. Use an RFO form FL300 and under other titled it "Motion to Strike Petition". (f)Motion to Strike. The court may strike from a pleading an insufficient defense or any redundant, immaterial, impertinent, or scandalous matter. A motion to strike is a request to a judge that part of a party's pleading or a piece of evidence be removed from the record. Learn how to prepare and file a written "opposition" to a motion that the other party filed against you. In California family law, motions to strike are generally filed to request the court to remove certain parts of the opposing party's pleadings.