回複：請問申請妹妹妹夫移民，他們那方要準備哪些材料？謝謝

The documents needed for the immigration petition (I-130) are as follows:

Copy of the U.S. citizen's Birth Certificate or Certificate of Naturalization or Certificate of Citizenship;
The U.S. citizen's birth certificate showing the name of both parents; and
The bother or sister's birth certificate showing the name of both parents.