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追加問一個問題
F2B類，美國居民成年離婚子女，如果有小孩，孩子已成年，也可以申請嗎？

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

其後，
這個父母再用F2B申請這個成年的小孩，應當如此操作，對嗎？

-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.