After completion of the case by NYC, interview date of my sister and family has been scheduled at the US Embassy at Johannesburg . Can you please let me know as to what type of questions are asked during interview. will they get visa same day, if everything goes well.
The questions in family-based cases tend to be basic and nothing to prepare for. Usually, the immigrant visa package could take a few days, but I am not certain as to the exact time frame. The consulates are good about responding to emails. Write to them.