Magic is real, that much is certain in the world we live in. And as a result of that magic, many strange and wonderful beings exist in the world.
Now it's not hard to know that things such as fairies exist. Don't need to explain what they are, but I will explain a particular fairy that exists in the world. This fairy is a very mischievous family that loves to mess with families over the span of a week.
Let's just say the fairy was to mess with a family of four, a mother, a father and two siblings; a 2 year old boy and a 10 year old girl with a pet dog. What the fairy will end up doing is switching the whole family situation around and messing the whole thing up.
The mother could become a dispersed toddler with the father becoming her favourite plushy. The boy could end up as the new mother while the girl would become the new dog with the old dog becoming the working father.
The fairy loves to mess with families and will do whatever comes to her mind. Now who gets affected by her?