Illinois Statutes Chapter 40. Pensions § 5/12-137. Eligibility for child's benefit

(a) from injury incurred in the performance of duty regardless of length of service;

(b) from any other cause after completion of at least 2 years of service;

(c) after the employee withdraws from service subsequent to age 55 and entered upon or is eligible for annuity.

In the case of an employee whose death occurs after withdrawal subsequent to age 55, if eligible for an annuity, birth of a child must have occurred before the date of the employee's latest withdrawal.

No annuity shall be payable to any child after such child's marriage. The termination date of any child's annuity due to the attainment of age 18 or marriage shall be the due date of the last annuity payment for the child, next preceding such due date with no proration for any period which is less than a full month.

A posthumous child shall be regarded as a child of the employee entitled to an annuity.