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 我妈妈今年80岁了，之前来过美国三次，每次都是住5个月按时回去。前年她突发脑梗，现在身体行动不便，说话不太清楚。她生病前拿到的10年B2签证还在有效期，我现在是绿卡，请问，

1）我想回国把她接过来与我同住一段时间，是否可行？

-No problem. Ths kind of desease does not matter for entry into US.  Check the website of the US Embassy in China to see whether there is any limitation or requirements on entry into US due to Covid 19.

2）如果可行，入关美国时我需要准备什么额外的资料吗？

-You had better bring the doctor or hospital diagnosis to prove that your mom has cerebral infarction. This desease makes her unable to answer the questions clearly asked by the immigrant official when she enters US.