Any suggestions on Parents '

visit to the U.S.? Shall I have my mom and dad to apply for VISA seperately or shall I have them go for the VISA together? They came here in 2002 and stayed for only one month. It's said they should have no problem this time, but there is also rumor aound me that if both parents go for the VISA together, they have less chance to get it. Any GGDDJJMM's parents recently got their VISA together in Shanghai? Thanks a lot. Sorry I couldn't type Chinese at work.