sorry for your loss. was there a will that dictates what happens to the property or was the property held in trust even a grantor trust? then they would dictate who reports the post-death activity.
did you live in a community property state/ if not, and there was no will or trust holding the property, it would seem that for 2021 the activity thru the date of death gets reported on the 1040 while the activity for the rest of the year gets report on the estate's 1041 income tax return
