In order to add the dependent to the dad's return that was already filed, the dad must file an amended return. He would not call the IRS to have this done.
If his taxes were done by a local person at an office instead of through TurboTax, then he should go back to that office and have them prepare the amended return to add the dependent.
There is no rush to get this done prior to April 15th. You have three years to amend a return after the due date.
@marlenne_28
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