My parents divorced and I followed my father. If dad's application for a tourist visa in the United States is rejected, is there any way to remedy it? What materials need to be prepared?

It's none of your business if one parent's visa is refused. Your father's tourist visa may have been refused because the interviewer thought your father had an immigrant tendency during the interview. When you apply for a visa, you must be honest. Visa application materials must be translated by a professional translation agency, such as translation agency, USA, which is stipulated by the embassy. Personally, I can't translate, so don't make trouble for yourself, or follow the rules!