@Lonestar you might also be interested in this treasury regulation about joint interests. IRS pubs are great, but they are not the law. They are not always right or clear. This section is from the gift/estate chapter but that is intertwined with income tax when inherited assets are involved.
https://www.law.cornell.edu/cfr/text/26/20.2040-1
also
https://www.law.cornell.edu/uscode/text/26/2040
and for step up
https://www.law.cornell.edu/uscode/text/26/1014
https://www.law.cornell.edu/cfr/text/26/1.1014-1
https://www.law.cornell.edu/cfr/text/26/1.1014-2
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