I don't want to claim my son as a dependent and answered "Yes" that he paid more than half his living expenses, but Turbotax keeps changing the answer to "No".

Son is a college student with earned income of $7700.  If I can't claim him as a dependent then he can get the education credits which I don't quailfy for due to the income limits.  How do I get Turbotax to to accept my answer that he paid more than half his expenses so that I can't claim him as a dependent?   Just deleting him on my tax form doesn't work because his tax form asks if someone else "can" claim him.