Yes, if you have a valid Power of Attorney, you can use TurboTax to file your father's return - either by mail or e-filing. Per @ToddL99
TurboTax files the returns electronically, so there is no actual signature on the returns there are self select pins that he can choose himself and file is return himself.
You may want to submit a form 2848 to IRS electronically after you file to be able to receive information directly on this client.
How to submit a Power of Attorney to IRS electronically
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