姐姐和姐夫的申請必須分開填
-You can not sponsor your 姐夫 GC application directly, but your 姐夫 and your sister's kids (if any) can get their immigration visa as the derivative status of your sister's GC application. So, you just need to file one I-130 for your sister and list your sister's family members'names in the Form I-130. That is all.
1)姐姐的申請,可以公證姐弟關係。
2)姐夫的申請,該如何證明與其關係?
-You do not need to 證明 the relationship between you and your sister-in-law.
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需要公證姐姐姐夫結婚證嗎?
-Yes. This document must be needed.
那位知道,在這先叩謝了!!