我有出生證公證件，但是兄弟沒有。我是否可以現在File I-130，然後再補他的出生公證？
-You had better provide all the required documents at one time, but not hurt you to try. If USCIS accept it, they will send you RFE later, then you can provide it. If they reject your application, they will return your materials and the payment, then you can re-file it after you get your brother's birth certificate.
這樣能有個早點的priority date。補出生公證能主動補吧，這樣是否不會延長處理時間。
如果等他辦了出生證公證以後再提交I-130的話，估計要等2個月。這個方法比較保險嗎？
