You can change the filing status for your son's return from married filing jointly to married filing separately. There are detailed instructions from TurboTax to do this. As long as the return has not been filed as MFS you can proceed to separate the returns.
You do need to start over and create two separate returns. Clear and start over using Tax Tools on the left side of the screen, and follow the instructions in this TurboTax Help article to create two separate returns.
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