I've never needed to show any I.D. for my kids. A drivers licence for the adults is all I've ever given them to redeem our E-tickets (for our SW passes). I assume the E-tickets you have would work the same. Have a Fun time at SW!!!
This question comes up alot and there are a few additional responses in this fairly recent thread if you are interested although the short answer is "no" kids don't need ID.
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