Q: Form I-864

Hello, so my wife does not have 20.000$ + a year, she did not work this year, so she can't sponsor me for this form, but my uncle can, so he is gonna be my sponsor, and I am gonna submit his tax for the last three years. So my question is, do I have to submit my wife last three years of tax return ? Or just the person who is sponsoring. Thank you

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