One last post appropriate for Halloween......
Thanks to 'Shirley Temple's Storybook', the world made famous by L. Frank Baum is a part of Toobworld (but an alternate dimension). "The Land Of Oz" was an episode in the series and related the story of how the witch Mombi turned Princess Ozma into a young boy named Tip. Also in the cast were the Tin Woodsman, the Scarecrow, Glinda the Good Witch, Nikkidik, Jack Pumpkinhead, and many other inhabitants of Oz.
With the episode, we can make a Theory of Relateeveety which could connect 'Shirley Temple's Storybook' - "The Land Of Oz" to 'Bewitched'.
Tabitha and Adam Stephens are the children of Samantha Stephens; Samantha is the daughter of Endora.
But who was Endora's mother?
I'm thinking Endora was not a witch native-born of Earth. I think she was born in the Land of Oz and that is where Maurice found her and fell in love with her, bringing her back to live on Earth Prime-Time. (Aunt Clara then would have been from his side of the family. Uncle Arthur we know was Endora's younger brother, so he was from Oz as well.)
So it is my contention that Endora was the daughter of Mombi the Witch.