If you are not claiming your son as a dependent this year, then you do not qualify to claim his education expenses. You should not list him on your tax return either.
If you would like to override claiming the American Opportunity credit and claim the Lifetime Learning credit on your son's tax return, then follow the directions provided by TurboTax LindaA below.
https://ttlc.intuit.com/replies/5778356
In the directions above click on Tax Tools in the left-side menu instead of My Account.
[Edited 02/19/2019 I 9:47 PM]
