申请移民,如何把 Fourth Preference 改成 First preference

男,未婚成年, 有美国公民父母和美国公民兄弟。已经有美国公民兄弟帮其申请移民,在排队中 --- Fourth Preference: Brothers and sisters of adult U.S. citizens, and their spouses and children.

如果改用美国公民父母申请移民 --- First preference: Unmarried, adult sons and daughters of U.S. Citizens, and their children. (Adult means 21 or older) 会快很多。

请问,这样的情况,是否可以改成公民父母申请移民, 如何改,填什么表。先谢谢各位专家。

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