Q:After the I-526 petition approval, can members of the family have their consulate interview in different countries (i.e. children attending school in the United States and the parents in China, etc.)?

Answers
Family members can interview in different countries. The country of origin or where the family has current ties is the standard interview site. Often one member of the family is located in another country, such as a student attending school in the U.S. The student does not have to return to the country of origin and can adjust status in the United States at the district office of the USCIS.