My relative uses a PC with Windows. Is there any Windows genealogy software comparable to Reunion?
We don't believe there is any genealogy software for Windows that compares to Reunion for the Macintosh. Since we only create and use software for the Macintosh, we can't make a recommendation about (and aren't that familiar with) Windows software currently in development.
If you can't convince your relative to buy a Mac, our best advice would be to visit the following page...
It contains a number of links to different genealogy programs.