It depends on your sons immigration status.
You will need to prove your child's U.S. immigration status.
I may have trouble proving his immigration status.
You will need to show his current immigration document, for example a Form I-551 Lawful Permanent Resident Card or I-766 Employment Authorization Document , EAD , work permit.
So I need original documentation to prove his status?
Yes you will.
What if my son is an F-1 student?
We will need to we see his I-20 Certificate of Eligibility for Nonimmigrant Student Status.
His name was changed 6 years ago.
You will need to show us a document from before his name was changed. It is ok if it is expired.
Ok, what if he doesn't tell his employer?