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求問8老師，我有一個同父異母的妹妹，是父親在外和另外一人生的，我們沒有生活在一起，我的父親也不在了，現在我想給我的妹妹申請移民。都需要那些材料來證明我們是姐妹，謝謝！
-Provide both of your birth certificates which show you have the same father. Because you are“paternal half-siblings” (the common parent being your father) you will need to provide documentation to USCIS showing that your father was once married to your mother, that their marriage has legally ended, and that he has married your half-siblings’ mother (and that if she was ever married, that marriage, too has legally ended).