request help for Visitor Visa B-2

[raj1982]

I am in US for last 2 years.
My Mother and Brother are applying for B-2 and their interview date is 19 Sep, 2013.
They are self sponsoring their visa.
My mother is widowed and house wife.
My brother is doing business for last 2 years.

1. What all documnets they should carry for interview?
2. In my invitation letter can I mention that I will take care of their house & food; and rest they are self sponsoring?
3. Apart from invitation letter from my side what all documents I need to send them?

Request you to please provide feedback.

Thanks & Regards

[immihelp]

1. https://www.immihelp.com/usa-visitor...tor-documents/
2. You write whatever you are willing to take care of acutally.
3. https://www.immihelp.com/usa-visitor...sor-documents/