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From what I remember, the prince was abducted by the nanny and taken to earth. The fantasy creatures (I believe they were different kind of mythical beings, like fairies and gnomes and such) locate the nanny with the help of an orphan boy they befriend.
The nanny's son, who they believe is their prince, is a horrible person.

Spoiler: it turns out the nanny abducted the prince because she thought she could not have children, then immediately afterwards got pregnant and abandoned the real prince. The real prince is of course the orphan boy who the creatures befriended and they take him back.

My memory on where and when I read this are extremely hazy. It could be I am mixing up a lot of major details of the book, if so I apologize.

I don't believe I've read it as a child and instead think I read the story to a child so I'd place it around 2005-2010, it could be way off though. Might have been read in German or English, in Germany or the UK.

This sounds a lot like The Secret of Platform 13 by Eva Ibottson.

Amanda wrote: "This sounds a lot like The Secret of Platform 13 by Eva Ibottson."

Thanks for the input! Sadly my memory of this story is beyond hazy so I can't verify right away as the cover and description rings no bell at all. But I found the ebook and will read it later today to check if this is what I remembered and let you know.

Amanda wrote: "This sounds a lot like The Secret of Platform 13 by Eva Ibottson."

Just finished the book and it is definitely the book I was thinking off, thank you very much!