Deductions & credits

Here is my full question that had too many characters to fit in the allocated space for questions: I sold three jointly owned personal residences prior to 1979 in which the gains were allowed to be deferred as a cost basis adjustment and I need to know how to deal with that issue on a personal residence jointly owned by my wife and I in 2018.  Turbo Tax does not seem to address this issue and I can’t find where IRS Pub 523 does either.