-Where are your parents now, in China or US? If they are in US to file I-485, they only need the photocopy. If in China, then need to provide the original one to NVC, and the US Consulate in Guangzhou will return it to your parents during the visa interview there.
我可以交原件给父亲的材料,然后复印件给母亲的材料,注明原件在父亲的材料里?
-Only need it for your father.
非常感谢!!