The sums so credited shall provide for annuities to be fixed and granted in the future. Contributions by the employee and by the city for purposes of this Article shall be made, and when the proper time arrives, as provided in this Article, new annuities based upon the total sum accumulated to his credit for annuity purposes and the entire term of service shall be fixed for the employee and his wife. If the employee's wife is not his wife when he re-enters service, no part of any credits for widow's annuity or widow's prior service annuity at the time annuity for his wife was fixed shall be credited upon re-entry into service, and no such sums shall thereafter be used to provide such annuity.
40 ILCS 5/11-161