The E-3 dependent visa category is for dependents of the E-3 beneficiary. E-3 dependents are eligible for full-time and part-time study. When E-3 dependent children reach the age of 21 years old, they will "age out" of the E-3 dependent visa category and will have to obtain their own visa status in an appropriate category.
E-3 dependents are eligible for full or part time employment with an Employment Authorization Document Card (EAD). E-3 dependents must complete the form I-765 for E-3 dependent employment authorization.
When maintaining an E-3 through Change of Status within the U.S., Extensions and Change of Employer applications, E-3 dependent status should also be maintained through filing the I-539 form. This form can be found on the USCIS website with instructions. In addition to thoroughly reading USCIS I-539 instructions, please refer to the International Office Guidelines for Filing the I-539 for E-3 dependents when filing this form with the E-3 application.