I thought the "conciliation/mediation" action was supposed to be a peaceful step towards divorce? It sounds like your wife is not taking a peaceful step...more a delay tactic. I would get with your attorney ASAP and bring up your opinion that it appears your wife is trying to dig up dirt to control the situation. Your attorney may advise another course of action to defend your interest.
From reading your story.....it appears that your wife and her parents just want you gone from the family other than money. I would call that aggressive hostile action and you will need a strong defense to counter that. I have seen many times on here WAS's come up with ridiculous accusations in the courtroom....to be effectively countered with the truth by prepared LBS's. The key word is "prepared" because there is also examples of LBS's not being prepared and getting destroyed in court.
Be prepared....the best offense is a good defense.