Can my brother sponsor my wife

As long as your brother has the financial wherewithal, he can act as the joint sponsor on form I-864 affidavit of support. You of course are the primary sponsor and are also obligated to submit form I-864, but your brother can submit a separate one to ensure that your wife will not become a public charge. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.