Solved
It was their primary residence. Turtotax is asking for Residential Property Flipping. I don't know how to fix it. they are in their late 80s.
@skeough8 I'm sorry to hear of your loss.
You can't NETFILE a return for a deceased person. You need to print out and mail it, and the executor of the estate (or legal representative) needs to sign it.

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