Board Thread:Spoilers!/@comment-25926288-20180327110306/@comment-35205453-20180407234334

Random idea:

Doctor Sage is Gretel and Jack's stepmother. Their stepmother could have magic. She could of been cruel to them and that's why Nick wants to kill her along with Zelena and Hilda (The witches that ruined his life) and Ivy (Killed Gretel).