Sorry you will need to log into his account that did the returns. You can’t get them from your account. Or get them from the IRS.
How to access prior online returns
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/01/270...
If you used the Desktop CD/Download program then the only copy is on your computer and not saved or stored online.
You can also request a transcript from the IRS
Get Transcript | Internal Revenue Service
