HI, I also had a joint sponsor who was a distant cousin, if I remember correctly they asked him for his 2005 taxes, and proof of residency. I think that was it, if I remember correctly he also filled out some paperwork. A few months afterwards my lawyer informed me that both him and I would need to submit our W-2's from 2005, and a letter of proof from our jobs. I couldnt get ahold of him but luckily the lawayer still had his W-2's from before, he said that it would be fine with just that.