child
(6) “child” means any natural, illegitimate, adopted, or posthumous child or stepchild of a deceased or permanently and totally disabled public safety officer who, at the time of the public safety officer’s death or fatal injury (in connection with any claim predicated upon such death or injury) or the date of the public safety officer’s catastrophic injury or of the final determination by the Bureau of any claim predicated upon such catastrophic injury, is— (A) 18 years of age or under; (B) over 18 years of age and a student as defined in section 8101 of title 5 ; or (C) over 18 years of age and incapable of self-support because of physical or mental disability;