Can I include my children if they were not originally part of the case?
If the visa for which you are applying allows derivative children, your unmarried children under the age of 21 may be added as derivative applicants after your interview has been scheduled. You must directly contact the embassy/consulate to request specific instructions. At the interview the added applicant(s) will be required to pay the same fees, and submit the same forms and supporting documents as the original applicant(s).