Its is your mistake not finding out their past. now you can sue or use them.
If you have solid proofs of anything about your wife which they hide that breaks your marriage then you can question them in court and may be used for Divorce.
Judiciary will not Annull your marriage, They grant you.
Mutual consent Divorce
Annull word comes, in if you are Christian, and married in Catholic Church as they do not have DIVORCE in their doctrine.
If she left you without reason and if its more than 1 year separation you can proceed with
Restitute conjugal rights or Divorce
and ask for Child visitation till he is 5 years old.