596.7  Revocation.
  After marriage, a premarital agreement may be revoked only as follows:
  1.  By a written agreement signed by both spouses. The revocation is enforceable without consideration.
  2.  To revoke a premarital agreement without the consent of the other spouse, the person seeking revocation must prove one or more of the following:
  a.  The person did not execute the agreement voluntarily.
  b.  The agreement was unconscionable when it was executed.
  c.  Before the execution of the agreement the person was not provided a fair and reasonable disclosure of the property or financial obligations of the other spouse; and the person did not have, or reasonably could not have had, an adequate knowledge of the property or financial obligations of the other spouse.
91 Acts, ch 77, §7