You can apply for a second passport for adult children under 30 years of age if they are financially dependent on you, e.g. if they study on full-time basis at a university and cannot earn money themselves.
You can also include in the application: disabled children of any age, parents and grandparents of both spouses over 55 years old. Unmarried siblings of the main applicant or a spouse who are financially dependent on them can also obtain an Antigua and Barbuda passport.