1， 我可不可以同時可以給弟媳婦申請？
-You only need to file one I-130 for your brother now. Then, when the priority date becomes current about 12 years later, his wife and minor child (if any) can get the immigant visa together with him to come to US to become green card holders.
2，如果不可以，是不是等弟弟拿到綠卡後，由他來辦理他太太的綠卡？
3，如果他為他太太辦綠卡，就行成：他在美國，妻子在國內的狀況。這需要多長時間他太太才能拿到綠卡（按現在的行情），需要排期嗎？
4，在弟弟等排期的期間（應該12年？），如果條件許可，可以改成投資移民申請嗎？
-Not 改成投資移民申請, but he can apply for immigrant visa using investment category any time, which does not affect the family-based category under your sponsor, i.e. your brother cann have tow types of the immigrant categories pending at the same time.
