Dad's return must have been in the small test batch they accepted early.
The IRS will not begin to accept/reject returns until January 28. Until then, e-filed returns will just be sitting on a server, waiting. You will receive an email after that date letting you know if your return was accepted or rejected. It will probably take several days after January 28 for them to work through the backlog of returns on the server.
https://ttlc.intuit.com/questions/4169486-can-i-change-my-return-if-i-already-submitted-it-and-you-r...
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