Dependent child.
Dependent child. This means an unmarried legitimate child (including an adopted child or a stepchild) who either
(1) Has not passed his or her 21st birthday; or
(2) Is incapable of self-support because of a mental or physical incapacity that existed before his or her 21st birthday and is, or was at the time of the veteran's or servicemember's death, in fact, dependent on him or her for over one-half of his or her support; or
(3) Has not passed his or her 23rd birthday; is enrolled in a full-time course of study in an institution of higher learning approved by the Secretary of Defense or the Secretary of Education, as the case may be; and is, or was at the time of the veteran's or servicemember's death, in fact, dependent upon him or her for over one half of his or her support.