I've compiled an extended list of Cheats and Commands

@Eef97 Yikes! I can recall using relationship cheats and encountering the same issue. I figured, you could save your family to the library and replace them existing family that you used the cheats with. I did not try out that suggestion directly, however I do remember using relationship cheats and the game being boinked afterwards, even after I tried restarting. I was hoping that it was not just me.