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While I have opened the area of the green fairies' kingdom where the children are kept, I still can't seem to figure out which kid is the right one and how to initiate the substitution with
edit: Just saw from another post that I need Toby's sword.
Where are you? Which doors are you talking about? The door to the children's shop opens if you have a key. You get that key from Detina at the entrance to the Fairy Queen's Castle if you have Persuasion of at least 100 and the quest to find the Young Knight. The next door there opens if you tap it.