谢谢您的回复， 还有两个问题向您请教。
1. 我儿子在加拿大读书， 我们file I-485 的时候他很难回美国与我们同时file， 如果他比我们晚些file是否还能加入我们的case。
-Yes as long as your priority date is current at that time. Just provide teh copy of your (primary applicant) I-485 receipt with his I-485 filing.
2. 体检与打手印是否必须在file I-485以后， 体检的有效期是否为一年？-Need to provide the physical exam result (I-693) with the I-485 fling. The physical exam has to be conducted within 60 days for I-485 filing.
