Can I sponsor my mother by combining our income? Or only the income under my name?

The Affidavit of Support form requires that the sponsoring U.S. citizen identify his/her own income, and if that income is not sufficient to meet the I-864p poverty guidelines for the applicable family size, then it may be necessary to have a joint sponsor. The joint sponsor generally may be any adult U.S. Citizen or Permanent Resident who has sufficient documentable income and who is willing to assume the responsibilities contemplated in the Affidavit of Support. This is an example of just one of the details in the application process that can be significantly more complex than it first may appear to be. Errors or inadequate supporting documents can create significant delays or even more harsh consequences. It would be wise for you, your mother (and, perhaps, your husband) to consult with an immigration attorney who, after learning all of the relevant details, would be able to advise your family about eligibilities, options and strategies and could offer legal representation in the application process.