You must immediately file a Motion to reopen the decree based on fraud. The fraud is that your spouse filed an affidavit of service indicating you had received notice of the proceedings with knowledge that she served them at the wrong address.
In Illinois, a party attempting to set aside a decree on the ground that it was procured by fraud must make the traditional showings required to prove fraud.
To show fraud, you must demonstrate that there was:
(1) a representation (in this case the filed affidavit of service),
(2) that was false (wrong address)
(3) its materiality, (without service, the case cannot proceed); and
(4) your spouse's knowledge that the representation was false when made
You also cannot delay. A person must act without unreasonable delay. That means you must file a Motion to reopen as soon as you are made aware of the entry of the Judgment and the fraud.
There are no specific forms for this type of Motion. As a result, you would be wise to hire counsel given the long lasting impact if you do not file properly or do not prevail. However, you can use and modify the generic Motion form entitle "Motion" located at http://www.lakecountyil.gov/CIRCUITCLERK/PUBLICATIONS/AllForms.htm
It should be supported by an affidavit (a notarized statement) as to what occurred and why it was fraud and why the Judgment should be reopened.
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