refers to the prevailing IRS definition in effect (See Tuition Waiver for Dependent Children).
Definitions vary by carrier, but may include natural or adopted children, and any other children who permanently reside in your household. Coverage may extend to age 18 or 19, later for full-time students.
All family members under 15 years of age; family members aged 15- 19 years attending school or aged 15-24 yeas attending a tertiary educational institution full-time (except those classified as husbands, wives or lone parents). (see also Non-dependent child)