If the return has already been accepted by the IRS, he will need to file an amended return. Yes, TurboTax will walk him through the process of amending his return to remove the dependent. The amended Form 1040-X can be e-filed.
It is perfectly legal for someone to not claim a dependent based on the situation that you described. It is a gray area and not specifically addressed by the IRS.
You will be able to claim your daughter on your return without a problem. His amended return could take up to 16 weeks to be processed. Your return that claims your dependent daughter should be mailed to the IRS. It would probably be rejected if e-filed since your daughter's SSN has already been used as a dependent. This situation will not create any red flags with the IRS.
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