Thanks for your response. I really appreciate it. He has the the copy of I-94. He just lost the oldest I-20. When he first time came to US., and he never went back China in 11 years.
If my husband can not get the oldest I20 from his school, what should we do?
He is principal applicant. Do we need to submit the RFEof me and my son first? Or just wait unitil my husband get the I-20? (I guess it is time-consuming, if he cannot get I-20 from his school)? Thanks