Please someone advise me. My American husband of 4 years aplied for green card for me (wife) and my two sons in October 2010. We were married in 2007 when the sons were 15 and 16,. My sons are here in college on valid F visa. We went for the interview 3 days ago(March 14), I got the green card aproved and one of my sons was denied. He (the son) traveled to Canada with his college friends for 2 days after we applied for adjustment of status. We did not know he cant leave the US while our application pending, that it means abandonment. He is 19 years old and has valid passport, visa and I-20. On the interview when he was told that he "abandoned" his application, he almost fainted. We did not know. It was a college trip. The immigration officer at the interview told us we have to reapply. What does this exactly mean? We have to file all the papers again,medical exam,fingerprinting, everything?