Your question concerns whether he is your dependent for the purpose of claiming the tuition and fees deduction The answer is that if you are able to claim him as a dependent on your tax return, then he is your dependent for the tuition and fees deduction. However, as indicated above, there are technical requirements for claiming someone as a dependent that are not just whether you provided support. Here is a good description of those requirements: https://ttlc.intuit.com/questions/1894472-who-is-a-dependent
It's very likely that you can claim him as your dependent, but simply answering the questions about your dependent in the Personal Inf section will allow TurboTax to determine this for you.
Answers are correct to the best of my ability but do not constitute legal or tax advice.
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