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?我的問題是：

如果他的女兒已結婚（25歲）但無子女。是否適合上麵解答的內容？

-No. Only minor (<21) unmarried child can apply for the immigrant visa together with the father.

如果不適合，如何（或有何方式）為他女兒家庭辦移民？

-After the father or the mother becomes a US citizen, then he/she can sponsor the married daughter (include her family)'s green card. That will take a long long time (at least 30 years from now on)!!

Of course the daughter can seek other immigration method, such as H-1B to green card, etc. as most people do.