Yes, you need to proceed through the interview questions for Child's Income (Under Age 24) in the Less Common Income section of TurboTax. Continue through the interview for this section until the Other Earned Income section and enter the Ordinary Business Income amount from box 1 of the Schedule K-1 for his S-Corp. TurboTax is assuming it's passive income due to his age so you just need to enter it as Earned Income to get the appropriate treatment.
@-Reese-
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