You claim all of your son's scholarship, tuition, other qualified education expenses and form 1098-T since he is claimed as your dependent on your tax return.  Your son doesn't claim anything. He is not allowed any education benefits as a dependent.

However, if the scholarship exceeds his expenses, the excess is considered taxable income to your son. In this case, your would claim scholarship/education expenses/form 1098-T to report that taxable income. The good news is: if excess scholarship is his only income and it is less than $6300 for the year, your son is not required to file at all.  

If student's earned income (such as W-2), when added to scholarship exceeds $6300, then he is required to file his own tax return. When he files -  be sure that he indicates on his tax return he is being claimed by someone else.