How helpful is the Affidavit letter I-139 & Bank Balance letter. Problem is I do not have any money so I was just thinking about sending employment verification letter and an invitation letter along with all the supporting documents from Nepal. My father was denied 2 times and I'd really like him to visit me this time......

I remember the Affidavit letter has to be notarized listing the bank balance, property value etc in the U.S. Any suggestions would be appreciated.