He can use the Free Edition. Just set up an account for him. Pick the Free Edition here, https://turbotax.intuit.com/personal-taxes/online/
Online is only good for 1 return per account. But you can use the same email address for 5 accounts. How to start another return in the Online version
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
Or There is also The Turbo Tax Free File program which is free for federal and state. And has more forms than the Federal Free Edition, like Schedules A, B, C , D, E, F, EIC, H, K-1, SE, etc.
To qualify for the Free File website you just need to meet one of these 3 things.
AGI $36,000 or less.
Active duty military with AGI of $69,000 or less
OR qualify for EIC (earned income credit.)
In order to use the Free File program, you have to start it at a special website. Click on the Orange button I Qualify, Let's get Started
https://freefile.intuit.com/
How to switch to the Free File website
https://ttlc.intuit.com/community/downgrading/help/how-do-i-switch-to-turbotax-free-file-program/01/...
