Not sure if this will help you. In my case I sent the letter from my School's Student Services / Academic Services that I was student of ...graduating in May 23, ...and that my parents were invited to the event..their name and passport number in parenthesis.Please help with visa process. This was pretty much standard letter from my school to all International Students. At their end, my parents were working at that time so they kept a letter from their respective companies and dad's bank statement (je ho tyai) in the file. That was about it. But my roommate who was also graduating at the same time, his parents weren't given visa with similar documents.