Once Upon A Time Season 3 Rumors And Spoilers: Are Snow, Regina, And Zelena Related Because Cora And Eva Are Sisters?

As "Once Upon a Time" prepares for its mid-season 3 premiere, spoilers and rumors regarding a blood relation have surfaced!

Recently on E! Online, it has been revealed that two major characters are in fact related, but more spoilers have been revealed about this twist.

Reportedly, because these two mysterious characters are related on "Once Upon a Time," it means two other characters are also related.

Although it doesn't confirm which two characters this "Once Upon a Time" season 3 spoiler is referring to, rumors are already circulating that it could be related to the upcoming mythology about the witches.

Spoilers by EW reports that actress Sunny Mabrey ("The Client List") will be joining Rebecca Mader in the second half of "Once Upon a Time" season 3. But while Mader is set to play the Wicked Witch Zelena, Mabrey will play the "elegant, warm, and benevolent" Glinda the Good Witch.

"The mythology of the four witches, we created our own," says co-creator Andy Kitsis.

One particular theory that is interesting is that perhaps Eva and Cora are sisters.

"Eva was the Good Witch of the North, and her older sister Cora was the Wicked Witch of the North. This would make Snow White and Regina first cousins," writes Lily on E! Online.

"To make it even stranger, Zelena the Wicked Witch of the West is the 'love child' of Cora and Leopold, making Zelena the half-sister of both Snow White and the Evil Queen."

What do you think of this "Once Upon a Time" season 3 theory?