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What should an old man who knows nothing do when interviewing an American immigration officer?

Is it IR5? As long as you can prove that the applicant is his child, prepare to take a photo with the applicant from childhood to childhood to learn about the applicant, such as the applicant's situation in the United States and so on. In addition, the applicant's guarantee should be sufficient.

Generally speaking, VOs interviewed can speak Chinese, so don't be nervous, don't understand or hear clearly, and don't answer randomly. You can ask VO to say it again, louder. If you really don't understand VO's Chinese, you can find an interpreter. Answer if you don't know, don't guess. Generally, VOs is very professional and won't embarrass people.