回复：有为兄弟姐妹办B2签证成功的吗？

Chinese government does not approve tourism to US, so in reciprocal, all PRC B1/B2 visa applicants need an invitation from the US side, although it's just a formality in recent years due to Chinese are wealthier now. So, it's formality, sibling, remote relatives, neighbors, friends you bearly know, all can come with your invitation if they can prove that they have means/ties and will return to China as promised after this trip.