Only your mom's birth certificate has your grandmo's info. - 回复：

来源: pjiang 于 2007-08-04 17:01:26 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (153 bytes)

so 2 certificates will build such relationship.

I don't think it's necessary to prove the relationship. A hospital document usually will do it.

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