1. Cinderella. Didn't exactly have the happiest relationships with her stepmother and stepsisters.
2. Snow White. Having a stepmother actively trying to kill you puts Cinderella's woes in the shade!
3. Hansel and Gretel. Could sympathise with Snow White. Would feel, at best, disappointed their father ever agreed to the stepmother's scheming at all, even if it was reluctantly.
4. The Emperor in the Emperor's New Clothes. Couldn't rely on his courtiers to be honest with him. Quite sad really. Makes me wonder if his vanity was an insecurity issue. How did he react, later, after his foolishness was soundly mocked? He really needed someone to tell him he was being an idiot (and be honest enough to admit he needed that, as I think we all do).
So jealousy, hatred, and insecurity are huge themes here. Hmm... fairytale relationships? Perhaps not quite so happy ever after then!