My father has a U.S. green card. When I immigrated, he was refused a visa. What questions will be asked when I am interviewed again?

Your situation is very complicated. First of all, although you were a minor when you applied, you are now 21 years old and there is no need to accompany your family. Let’s take a step back and say, you are underage and your mother is in China. If your mother is not willing to go, then your mother can take care of you in China. Then if you go to the United States, don’t you have a tendency to immigrate? You will definitely be refused a visa!

For the interview again, you must prepare your answers:

1. Why not live with your mother in China but go to reunite with your father?

2. What did you go to the United States for? Work? read? (Actually, you can’t say work at all, so you’d better say studying. In that case, he will ask you, have you applied to the school, what major, etc. are related to the school)

I feel overall it's unlikely. If you really want to go, then apply to study in the United States. By then it will be an F1 visa, so you don’t need to mention your dad at all. Went to reunite with him.