Yes, Hal_Al is correct and a federal return is not required for your son because his income is below the filing requirement. He would file to receive a refund only on both federal and state.
Yes, for your son the free version would include the state return as well if qualified and TurboTax will let you know:
Per @AmyC - He can enter his w2 on the free version and file federal (if desired) and state. See IL filing
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