AOS Checklist
Cover Letter listing Table of Contents
(Check Payable to U.S. Department of Homeland Security - $1,225.00)
Form I-485 (completed and signed by non-US Citizen/beneficiary)
Form G-1145
Form I-944 (Declaration of Self-Sufficiency with applicable supporting documents.)
Copy of beneficiary's Passport with biographical page
Copy of beneficiary's K1 Visa from Passport and entry stamp
Copy of NOA2 Approval letter
She should file using the I-130 Receipt notice.
I-864 is filled-out by your brother, and the rest of the forms by your mother. In general, send the following four packets (*note that I-765 and I-131 packets are optional, but highly recommended) in the same envelope to the Chicago Lockbox:
I-485 with I-130 Receipt notice, I-864 and supporting documents, electronic I-94 copy, filing fees, etc.;
I-765 with electronic I-94 copy, etc.; and
I-131 with electronic I-94 copy