Visitor visa for parents and sister for attending graduation ceremony

[parulp0802]

Hi,

Me and my parents are planning to visit US for 20 days to attend my brothers graduation in May.
The return tickets are booked. Family visa appointment is scheduled in mid-April.

Please share what types of documents I should take in order to get the visa. Below...

[findsanty]

Hello,

Both my brother (M.S.) and I (Ph.D.) are graduating in December (same university) and would like to have our parents and sis over for the graduation ceremony. Is it a good idea for both of us to send invites to our family?

Dad (70) is retired, mom (60) is homemaker...