The movie is about magic and fantasy!
A brother and a sister move in a new house with their parents
And there enters a little boy the brothers body!
Than they search for somethink IDK what!
And on the end of films they are in a cave and on a lawn!

When the film starts is there a flashback and there are people in dark coats!
And reading a book! Than the film comes back what I writed up there!

If you know whats the name of the movie please help!