Scholarship income is reported on Schedule 1.
The excess income your son received is his income, so he would need to claim that portion.
Depending on his income, he may or may not owe tax on that income so he may or may not be required to file a tax return.
According to the IRS:
"Form 1040 or 1040-SR. If you file Form 1040 or 1040-SR, include any taxable amount reported to you in box 1 of Form W-2 in the total on line 1a. Include any taxable amount not reported to you in box 1 of Form W-2 on Schedule 1 (Form 1040), line 8r."
Pub 970
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