Family Records 2.3.1, better known as PAF for Macs, is perhaps the most widely used Family History application for the Mac. It was created in the 1980s but does not appear to be available anymore. PAF 2.3.1 only runs on the Classic OS - OS 8.5 through OS 9.2.2
As an alternative to PAF for Mac, it is possible to run the latest version of PAF 5.2 for Windows using Virtual PC and downloading PAF 5.2 from the Church Distribution Center.