This story is taken inspiration from the story Brother and sister by brother's Grimm. If you don't know what it is then it's about a brother and sister running away from their step mother who turns out to be a witch. The sister ends up marrying the king to protect them from the step mother. I found there are different versions of what happens in between events. One kidnaps the sister and another poisons her. I could be wrong about the whole of this but watch on YouTube the story or go and find the book. But after reading this one first.
6 parts