Visitor visa for parents or relatives.If you are the sponsoring visitor visa for your parents or this trip is sponsored by any of your relatives, friends, certain documents are required from you.
Financial documents ( To demonstrate your financial ability as a sponsor)
Sponsor's residency status in USA
For parents visiting their children in USA, the sponsor child must also provide the following documents.
FAQ for the Sponsor:
As a sponsor Do I need to send documents directly to VFS or US Consulate? Or the applicant will carry the document to the consulate at the time of interview?
As a sponsor you should send the document to the applicant, and let applicant should carry those documents to the consulate for the interview purpose.
Do I need to send separate I-134 form for each visitor?
If persons applying for Visitor Visa are husband wife and their children you don't need to send separate forms.One from is sufficient and the same form will have space to provide their details.
For example: if you are inviting your parents(Father and Mother) or your in laws (Father in laws and Mother n laws) just one form, is sufficient.
How much minimum savings(Balance) should be good to show in my(sponsor) Bank Account?
There is no official limit or set rules for any minimum balance requirement for your bank account. Any amount that can justify the over all cost involve to support the trip and your financial ability to take care of the expenses related to trip. People's experiences say that any amount over $5K to 10K$ should be good, More is good. Provide proof of funds for as much as possible.