Q: Do I add my sister's kids on CEAC as a derivative applicant before submitting everything?

A: Yes, you need to add your sister's kids as derivative applicants on CEAC before submitting everything. Derivative applicants are family members who are eligible to immigrate to the United States with the principal applicant. In this case, the principal applicant is your sister. Her two kids are derivative applicants because they are unmarried and under the age of 21.

To add your sister's kids as derivative applicants on CEAC, you will need to do the following:

1. Log in to your CEAC account.

2. Click on the "Applicant Information" tab.

3. Under "Derivative Applicants," click on the "Add" button.

4. Enter the information for your sister's kids, including their name, date of birth, and relationship to you.

5. Click on the "Save" button.

Once you have added your sister's kids as derivative applicants, you will need to pay the Immigrant Visa Fee for each child. You will also need to complete a Form DS-260 application for each child.

Here are some additional things to keep in mind:

* You will need to provide proof of your relationship to your sister's kids. This can be done by providing a copy of your birth certificate, your sister's birth certificate, or a marriage certificate.

* You will need to provide proof of your sister's kids' citizenship or nationality. This can be done by providing a copy of their birth certificate or passport.

* You will need to provide proof of your sister's kids' age. This can be done by providing a copy of their birth certificate.

Once you have submitted everything, the National Visa Center (NVC) will review your application. If everything is in order, the NVC will schedule an interview for your sister and her kids at a U.S. embassy or consulate.

I hope this helps!