非常感謝8老師耐心的解答！還有一事想請教：
一旦移民局批準我的DS-260並且發出引見信邀請我去廣州使館麵談，如果我去了，要麽拿到移民簽證回美國，要麽被駁回連F1都被取消了就再也回不來了，我這樣說準確嗎？
-Right, but as long as your mother gets the immigrant grant visa, you should have no problem to get it. You don't need to leave US until you get the appointment notice for the visa interview. By the way, if you get the immigrant visa in China, you need to come back to US together with your mother or after your mother enters US. You can not enter US before your mother.
那麽我的F1學生簽證具體是在哪一步哪一個時間點失效的呢？
-When you leave US, then you will have a problem to come back if you want to use F-1 visa.
如果待在美國等待父母移民入關後申請I-485，請問依然可以用之前的F4親屬移民來申請嗎，
-Yes. As long as you are not age-out, you just need to file I-485 to get the green card within US after your mother enters US (you need to provide the copy of your mother's endorsed immigrant visa stamp or her green card, and the copy of the I-130 approval notice).
還是F2親屬移民？
請問之前有先例成功嗎？
-Yes. No problem at all, and it just delay your green card a little (you have to wait for your mother to become the green card holder, then you can be qualifed for I-485 filing) if you want to file I-485 to get the green card.
因為查到的先例好像都是回國麵談，也不知道最終結果，隻是覺得風險好大，有可能無法繼續讀書。
謝謝8老師的耐心解答！
