表妹一家想来美国旅游,表妹护照签发地是江苏,表妹夫和他们的儿子的护照签发地是重庆,他们这样的情况是不是表妹必须去上海领馆签证,表妹夫和他们的儿子需要去成都领馆签证? -I think it works, but I am not very sure. You had better contact the US Consulate in Shanghai.
他们是准备一起来,签的时候怎么说呢? -Nothing different. Just tell the truth for the questions asked by the VO.