4楼 answer your questions in more details:
For other documents or materials (公正材料) such as prove of no crime records, etc, you don't need to prepare now. Because first step you just need to submit I-130 peption for your sister. After you submit your application, there will be a long waiting time. Usually it takes about 1 year for USCIS approve, then approved application materials will be forwarded to US State Department for immigration waiting list. This will take about 10 years waiting time for sisters abd brothers ( half to one year for parents or sons and daughters, because these are immediate relatives, no waiting time). When you get your waiting time, then you can ask your sister or brother to get other documents(公正材料), because USCIS need updated (new) 公正材料. if you do it now, later on you need do it again, it waste money and time. not necessary.
Only thing is: if you did it 10 years again when you just got your US citizenship, now your sister might have got her waiting time now. But never too late!
Am I making myself clear? |