The DWI's should be a matter of public record you can simply go to the court house and request the file and copy/review it the same with the police reports of the dwi's you can use this as your defense in court on the contempt but it might not get you to far so be prepared for the time he has missed to be made up. But I would also file for a modification might be a bit of a stretch but if in those records she had children with her then you might have a leg to stand on. I just hope/don't want you to loose credibility with the court with the contempt and that would hurt your chances for a modification.