我先下載了紙的I-130做準備，找齊了資料，然後上網File I-130。
最後提示我上傳資料，第一項是我的公民身份證明，第二項是兄弟關係證明
Proof of sibling relationship
Upload a copy of your birth certificate and a copy of your brother's or sister's birth certificate showing that you have at least one common parent.
If you and your brother or sister have a common father but different mothers, submit copies of the marriage certificates showing that your father was married to each mother, as well as copies of documents showing that any prior marriages of either your father or mothers were legally terminated.
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？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？
謝謝您的幫助。
