Attach copies of all IRS W-2 forms issued to the parents by their employers. List every employer even if they did not issue an IRS W-2 form.
An IRS Verification of Nonfiling Letter or other confirmation of nonfiling from the IRS is required and can be requested by completing, and mailing IRS Form 4506-T and checking Box 7. Form 4506-T is available at https://www.irs.gov/form4506t.