If I have this name, I can have a handprint without my signature, which is equally effective. But the problem you said is that you are arguing about the validity of this complaint, not your wife, so as long as your wife thinks that she wrote it herself, or although she didn't write it herself, the above meaning is her true meaning, which is equally valid, and her sister can't be held accountable. The only way to hold my sister responsible is that I think my rights have been violated. You can't.

What you should do is to actively respond to the lawsuit and try not to divorce. If you really want to prove this, take a copy of the complaint. The words you and your wife usually write are also easy to find at home. You can apply for handwriting identification or entrust a people's court to do it in the judicial identification department, usually at the county level. However, this does not affect the effectiveness of the complaint. It only shows whether your relationship is really completely broken. Your wife still has a certain affection for you and doesn't want to write a complaint herself. Maybe your wife is determined to divorce because of your appraisal.

Mainly depends on your wife's attitude. If your wife really doesn't want to, she can drop the lawsuit, or settle it after the judge mediates in court.