On form 8615 it says that "filing status should be blank" but I can't uncheck the box for parent's filing status.

To make the filing status blank, delete the form in TurboTax:

1. Select Pick up where I left off, if that’s on the screen
2. In the menu on the left, select Tax Tools, then Tools.
3. In the Tool Center pop-up, select Delete a form.
4. Select Delete next to Form 8615 in the list and follow the onscreen instructions.

After this you should be able to file with no issues.

If you need to re-enter your child’s information:

1. If you’re on the Hi TurboTax Client, let's keep working on your taxes! screen, click the Pick up where you left off button
2. Click Federal in the left pane, if you’re not already there
3. Click Income & Expenses in the banner
4. Scroll down and click Show more to the right of Less Common Income
5. Click Start or Revisit to the right of Child's Income (Under Age 24)
6. Enter all relevant information on the subsequent screens