As long as you are the members of the same household your brother-in-law's income can be counted towards meeting affidavit of support requirements. You would have to submit supporting documents demonstrating his income and legal status in the U.S., this should be sufficient to show same residence address.
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Your brother in law could be a co-sponsor if he qualifies financially.
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Yes, he can be a co-sponsor.
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