31843. As used in this article “child” means a member’s child who is dependent upon such member at the time of his death and while such child is unmarried and:
(a) Under 18 years of age, or
(b) Whether under or over 18 years of age, totally disabled and such disability occurred prior to such child attaining age 18 years.
(Added by Stats. 1961, Ch. 1591.)