?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.