In order for you to get to the RMD question, you are inputting something. The RMD question goes with the form you are inputting. If it is a 1099-R from a pension, then yes, all of that pension was RMD. Since you and your sister are putting the IRA on your returns, it would not be on your father's.
The IRS has a quick How Do I File a Deceased Person program. It is very detailed and may give you additional information.
I am very sorry for your loss.
Related: Required Minimum Distributions for IRA Beneficiaries
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