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追加问一个问题
F2B类，美国居民成年离婚子女，如果有小孩，孩子已成年，也可以申请吗？

-No. The grandparent can do nothing for the grantchild immigration at this case.

其后，
这个父母再用F2B申请这个成年的小孩，应当如此操作，对吗？

-After the parent becomes green card holder, then the parent can file I-130 for the child as long as the child does not get married.