B2 Visitor Sponsor Doubt

[tempeguy]

Hi,

I recently graduated and am inviting my parents and brother for my graduation ceremony. I plan to show my parents as self sponsoring. I want to show my dad as sponsor for my younger brother(still a student). What are the sponsor documents needed in this case?

Also what is a decent amount to be shown as savings + fixed deposit for all three of them combined, for a trip of 2 weeks (parents) and brother one week.

Any suggestions are much appreciated.

Thanks

[immihelp]

1. Sponsor documents are listed at https://www.immihelp.com/usa-visitor...sor-documents/
2. Something like $5,000 per person is good.