Can the old man who signed the interview in Guangzhou Embassy in the United States accompany him?

no. If you apply for a visa together with the elderly, you can apply at the same time in one window. If you only apply for a visa by the elderly themselves, the elderly can't be accompanied by the Guangzhou Embassy in the United States. Only the elderly are eligible to enter the American Embassy to apply. Whether it's two or three months old infants or retired people in their sixties and seventies, they need to go to the consulate for face-to-face interviews. And all the face-to-face visas for immigrants must come to the US Consulate General in Guangzhou for face-to-face visas. Adults who apply for visas are usually not allowed to be accompanied.