Generally, the assets of a co-sponsor equal to or in excess of 125% minimum poverty guidelines may be considered.
See the link below for the USCIS instructions to the Form I-864, affidavit of support.
I agree with my colleague. You should consult an experienced immigration attorney for this matter. You may schedule a consultation with an immigration lawyer in your area, my firm is handling these matters in New York. If you would like free legal updates on these immigration issues you may sign up for our newsletter at http://www.shautsova.com .
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