回複：這樣幫我哥留下行嗎？

Are you concerned about whether your brother comes to US and unlawful presence (黑下來) will affect your status or something related?
I would like to say if nobody (especially 組團的人 in that文化交流團體)report this to USCIS, I do not think this will be a problem. But if the people in that文化交流團體 report it to USCIS or Chinese Embassy, your brother might be arrested and deported out of U.S.