我擔保的我弟弟一家三口剛獲得F4移民簽證（一家三口都是我一人擔保的）。我弟弟和我侄子準備聖誕節前入境。弟媳因故準備延後一點，在春節前入境。請問這樣的安排他們/她入境時會有麻煩嗎？
-Fine. As long as your brother enters US first, his family members can enter US together with him or any time later before the immigration expires.
需要準備什麽額外的材料嗎？
-She had better bring a copy of your brother's green card or the endorsed immigration visa (i.e. when your brother enters US with the immigration visa, the IO at the port of entry will put a stamp on the immigrtation visa to indicate your brother gets his permanent resident status/green card status).
多謝多謝！
