I filed for I-485 with USCIS, I received a letter asking initial evidence to be provided. The first one for my first sponsor which is my wife, USCIS, is asking for evidence of employment and pay stub, even though she got paid by cash at work and she is not the main sponsor since I have a joint sponsor. For my joint sponsor, they are asking for recent year W2, 1099 and tax schedule, but he has not filed 2011 tax return, will they accept only the W2? and for my wife, can her work just issue a letter for her covering this? She only worked for two months last year (Nov/Dec), in which she lost the job.