When you receive a 1099-R for full dispursement of a deceased parent's pension plan, mark it as an RMD regardless of the amount, unless there is a code provided on the form. If you're receiving a 1099-R for a deceased parent, chances are you are age 61+. If so, the 1099-R will show you the total taxable amount. Enter that when prompted. I recently received a pension payment for my parent and all of the above were true.
Hopefully this offers more detailed information for you. Cheers!
