Co-signing his student loan has nothing to do with the AOC. But if he is your dependent you can enter the 1098T and claim the education credit.
https://ttlc.intuit.com/questions/3262983-who-is-eligible-to-take-the-american-opportunity-tax-credi...
https://ttlc.intuit.com/questions/1901526-what-s-the-income-limit-for-the-american-opportunity-and-l...
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