Between Gate [their "pet" gate which seems to be sentient, romping with people and opening up for them], Morticia saying she studied "spells and casting", Granny/Mama working over her cauldron in the 1991 movie, and especially Thing, I'm guessing this would be a given. But it's never implicitly said or shown this magic "working" in real life...well, except for the presence of Thing.
"Ghosts" or departed spirits seemed to have been mentioned specifically before, though. So, should we take it for granted that,in general, actual supernatural /paranormal elements are just a given, or is it that things being "mysterious and spooky" are particular to the Addams Family themselves?
Or perhaps...might this more be a case of the "magical real"?