How do I get a joint sponsor for fiancé visa?

As your father will be your joint sponsor for your fiancé, he can fill out form I-134 affidavit of support along with providing his job letter, recent pay stubs, bank statement, and last year's tax return. He would send those to your fiancé, who would present the paperwork at the time of his interview with the US Consulate. 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.