Whats the disney movie where a brother and sister who have phsycic abilities?!

its not Witch Mountain i dont think!.!.i remember it when i was like a kid which was the 90's and i remember like "purple" glow would happen when the kids used there abilities!.!.and like the story is theres a planet where everyone has a twin!? theres part i vaguely remember!.!.like there boy is liked in a stall at a horse ranch!.!.then the two kids are trapped in a tunnel but then they make it fly out!?Www@Enter-QA@Com

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