I'm sorry to hear of your loss.
Because you have to file your parents return separately this year, TurboTax isn't able to pull the information from one spouse to another. So, you would see this regardless of which parent you started with. To continue, you'll need to enter an estimate of your father's net income. Then, before you file, you can go back and update the number if its incorrect. You can get an estimate from previous tax returns, or by looking at his tax slips.
You also might have to do some calculations if your parents did pension splitting, as TurboTax can't automatically do it when the returns are separate.
FYI: If your father owned a principal residence at the time of his death, then you won't be able to use TurboTax Online for his return. It doesn't have the form that is needed. You can find the form in the CD/Download versions of TurboTax.
