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朋友一家(绿卡）回美国休假1.5个月，想请他们带弟弟9岁女儿(她今年1月和弟弟一家来过，有美国10年签证)一起来美国，过完暑假后一起回中国，我的问题是：

1. 可以请朋友一家带过来？(他们同意) 
-Yes.

 2. 需要准备些什么材料？
-Nothing because they are green card holders and the child has already had 10-year B-2 visa.  Technically, you have nothing to do with their return to US because they are green card holders. The child is only related to theirs (the child is visiting them, not you).

Of course, they can visit you and live in your house temporarily, but you still are not required to do anything by law.


非常感谢！