In mc case wife filed a petetion with fake sign

In MC case wife has submitted a petetion asking my salary details, Locker details, Bank account numbers etc..

In that petetion(Affidavit) my wife signature is fake. When I compaired with other signatures which is signed orginally by wife this signature is fake and I am 100% sure of that. I applied for certified copies of this petetion.

In this sinario how can I prove to the court that signature is fake

Experts pls advice