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The IRS worksheet requires that other children unearned income be add to line 2, but I can't find the input field. The parent's rate is 24% but the tax is coming out to be approximately 45% and then in the summary it says 12%. Something is screwy.
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There are some help articles https://proconnect.intuit.com/community/estimated-taxes/help/using-form-8814-or-form-8615-to-report-child-s-income/00/4816 has broken links that @IntuitBettyJo will put the content team on to clean up.
To answer your question - You are in the Parents income screen, look up and a bit to the right and you will see Child - Click that and you will given a screen to add as many tabs as you need to add other childrens info and income. 
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