我想邀請哥哥，嫂子和侄女來美國玩，哥哥因為忙，可能來不了，所以也就嫂子帶著侄女暑假時來一個月。我不太清楚他們簽證需要準備些什麽材料，
需要我和我哥哥的兄妹公證
-They had better have this document for the visa applications..
以及他們的父女母女公證嗎？
-Your brother marriage certificate (original) and the child birth certificate (original) and not need to 公證 these documents and not need to translate into English (the Visa officer know Chinese very well).
還需要一些其他的什麽材料？
-See:
