My wife just became Citizen and filling for my I130, 485, 765 and 531. She does not work and I have been laid off on H1b since January 2009. My borther (US Citizen) is a joint sponsor and filling out I-864. Do any of us (me or wife) need to fill ou I 864? If so what documents do we need to submit alongwith I864. Pease advise. 