How long ago was the Decree entered. Your wife has 6 months from the date of the Notice of Entry of Decree to file a motion under NRCP 60b to set aside the decree. On the alimony issue, make sure a notice of entry was filed and served to ensure that the six months has be elapsing. If it is past the 6 months, then on the alimony, you are in the clear. On your annuity, if it is not specified in the decree as being awarded to either of you, and it was aquired during the marriage, the Court retains juridiction over it indefinitely. SO she could file a motion to apportion omitted assets as it pertains to the Annuity. Good Luck
She cannot get alimony unless she has some claim of fraud or duress. However, she can get half of any asset that was not disclosed, and she gets half of the value of the marital portion (that amount acquired during the marriage, from date of marriage to date of divorce) as it was at the time of the divorce.
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If alimony was not ordered int eh original Decree, it cannot be ordered now. And whether or not she can get half of an account is left for argument - omitted assets are divided. But if the asset was known, there is argument that it not be divided.