Generally, if you want to visit (and not live) the United States, you must have a visitor visa. How was your document drop-off experience? Thank you for explaining all the steps in detail. A passport valid for six months beyond your intended date of entry to the United States. This is to make sure you are in good standing in US and are getting paid to support the travel of your parents. one for my son and another one for my daughter? I have booked my visa dropbox appoinment at Chennai. Copy of Bank statements from last 6 months. Later I use add names to include my nephew and niece who are below 14 and pay there fees.