A child's annuity shall be $140 per month for each child, and shall be subject to the following limitations:
(1) If the combined annuities for the widow and children of an employee whose death resulted from injury incurred in the performance of duty, or for the children where a widow does not exist, exceed 70% of the employee's final monthly salary, the annuity for each child shall be reduced pro rata so that the combined annuities for the family shall not exceed such limitation.(2) For the family of an employee whose death is the result of any cause other than injury incurred in the performance of duty, in which the combined annuities for the family exceed 60% of the employee's final monthly salary, the annuity for each child shall be reduced pro rata so that the combined annuities for the family shall not exceed such limitation. A child's annuity shall be paid to the parent who is providing for the child, unless another person has been appointed the child's legal guardian.
Beginning with any child's annuity payment made on or after July 1, 1988, all child's annuities otherwise payable at the rate of $140 per month shall be increased to 10% of the employee's salary at date of death if greater than $140, subject to the limitation that the combined annuities for a family may not exceed the applicable amount hereinbefore in this Section stated.