My favorite TOS episode! I wasn’t alive yet when it aired, but I’ve seen it numerous times since. This episode rivals Best of Both Worlds (TNG) and The Visitor (DS9), both of which are the best Trek has ever done.
I’d argue that Far Beyond the Stars and In The Pale Moonlight sit alongside The Visitor for best Trek ever. BOBW is good but doesn’t break my top 10. I much prefer Family over BOBW.