My question regards the affidavit of support for spouse?

As the petitioner, your husband will always be the primary sponsor, and as such he WILL need to submit his latest 3 federal income tax returns, even if the income is $0 on them. So have him file those tomorrow. Your father-in-law can be the co-sponsor if his income is sufficient.

Both, primary and co-sponsor will submit one I-864 to the USCIS. If you file form I-765 with your AoS package, which is FREE if filed concurrently, you'll have your work permit (EAD) between 10 and 12 weeks later.

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