He needs me to be is sponsor because the income of her wife is low
Generally, minimum household income must be equal to or greater than 125% of federal poverty guidelines for your household size (with exceptions, such as military background).
See this link and seek an immigration attorney for guidance, there are ways to establish the income requirement other than salary, particularly if other assets are owned (stock, prop., etc).
You have to read the instructions for the I-864. It is fully explained there. If you need more assistance, then consult an immigration lawyer.
Good luck to you.
Dean P. Murray
The Murray Law Firm
560 Sylvan Avenue
Englewood Cliffs, NJ 07632
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