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收养的孩子的出身证明显示的是他的生父母亲,
-Fine. Provide it also.

是不是收养公证书就足够作为亲属移民的文件?
-Yes, provide the copy of the adoption certificate/decree, and also provide the evidences proving that the child was in the custody of and resided with your brother for at least two years after the adoption. 

 还要其他文件吗?谢谢8老师.