The first step to challenging a Will in Ontario depends on whether probate been granted? Any person can go to the local court registrar and do a search to see if the court has granted a certificate of appointment which established the validity of the Will (Probate). If probate has not been granted then the person objecting to the will can file a form called “a Notice of Objection” with the court registrar. If probate has been granted then the person objecting to the will has to bring a motion for the return of the certificate of appointment.