You don't put his W-2 income on your tax return.
You'll have to create another account and file all his stuff separately.
But he can only get a "possible' refund , only if Federal taxes were withheld (no..not SS or Medicare, just regular Federal income taxes in box 2.
Of course, perhaps his income is below the minimum filing level, but that depends on his Total income and various types of income. Make sure you have filed your own taxes (and had yours "Accepted") BEFORE the child's, and use an entirely separate account for each one. AND make sure you indicate that the child can be claimed by someone else when you create that dependent's tax file.
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Yeah, sometimes parents can include interest and dividend income for their child on the parent's tax return, if below a certain $$ amount, but once they start getting a W-2, the child must have their own, separate, tax filing.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
