@fpc wrote:
...I've been looking at a 1040 for the surviving parent for 2020, a 706, which I don't think needs to be filed due to the size of the estate, and then a 1041 that should have already been filed,
You should not have to file a 706 if the only asset is a house worth around $130,000; clearly that is not even a close call.
Further, you should not have to file a 1041 unless there are other assets since, presumably, no income would be generated by a house held for personal use; an estate is required to file a 1041 if the gross income for the tax year is $600 or more.
See https://www.irs.gov/instructions/i1041#idm140229151947712
