I'm not certain of how Turbo Tax handles the operations of efiling a decedent return.
However, you will need to attach Form 1310 to the return if you are claiming a refund for your dad. Only if you are requesting a refund.
You might also have to attach Form 56 in order to be able to sign the return on his behalf as his executor.
These two forms might make it easier to file paper instead of electronically - I did that with my dad.
