My maternal aunt (US citizen) had filed for a Family Preference Immigrant Visa (F4 visa) for my family with a priority date of October 2003. She had petitioned for the following family members:
- My mother (petitioner's sister and the actual beneficiary).
- My father (petitioner's brother-in-law).
- My younger sister (petitioner's niece).
- Myself (petitioner's niece).
The date the petitioner received a Welcome Letter (PAOSF) from the National Visa Center on September 4, 2015. I was 26 years old on that date, it made sense to me that my name was not on the list at all.
After a few weeks, we received an invoice from the National Visa Center asking us to pay the visa processing fees for my mother, father and my younger sister (then under 21). I went ahead and paid all the fees. The invoice also said only to pay the fees for the persons listed in the invoice and that's why I paid the fees for all three of them.
Problem: I received a notice for interview on August 31, 2016, which only lists my mother and my father. My sister, who is now over 21, has not been asked to appear in the interview.
Questions When the NVC asked me to pay tje fees for my younger sister, she was under 21, and she was entitled to receive an interview notice. I don't think that it's our fault the interview notice came a year afyet paying processing fees. I called the NVC customer service and the customer service agent has recommended me to ask the visa interview counselor to run the CSPA Formula.
My parent's interview is not until next month and I am really worried that my younger sister will be left behind while my parents emigrate to the United States.
EDIT-1: What is the CSPA formula and how can my parents convince the interviewer (counselor) to grant a visa for my younger sister as well?