I saw this movie when I was little in the 90’s. I am pretty sure we rented it from a video store and it was in color and English. All I can remember is that these two kids were in their father’s office? they went through a mirror into another land. There, the villain put them in a giant tea bag to make them into tea, but their imaginary friends saved traded places with them? I think there were also like blue pebbles in the movie that had some sort of significance. It has been driving my sister and myself crazy because we cannot figure out what this movie is called.