我先下载了纸的I-130做准备，找齐了资料，然后上网File I-130。
最后提示我上传资料，第一项是我的公民身份证明，第二项是兄弟关系证明
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.
我有出生证公证件，但是兄弟没有。我是否可以现在File I-130，然后再补他的出生公证？这样能有个早点的priority date。补出生公证能主动补吧，这样是否不会延长处理时间。
如果等他办了出生证公证以后再提交I-130的话，估计要等2个月。这个方法比较保险吗？
谢谢您的帮助。
