You will need to check to see if Form 8814, Parent's Election to Report Child's Interest and Dividends has been created in your tax return. If so, it will need to be deleted.
Here are the steps to locate and delete Form 8814 in TurboTax Online:
Sign into your account and click Take me to my return
Select Tax Tools (in left menu column) then select Tools from dropdown menu
A Tools Center window will open, select Delete a form
Scroll down the list of forms in your tax return and look for Form 8814, Parent's Election to Report Child's Interest and Dividends and select Delete