When I log in under his email, it sends a code to him, so I can't get in to see the old tax form. What can I do. It was never printed.
Try here
https://www.irs.gov/individuals/get-transcript
You can get a free transcript from the IRS or for a fee of $30, an actual copy of your tax return.
https://www.irs.gov/pub/irs-pdf/f4506.pdf