this might be an extremely hard one.

[seeem3991]

a couple of years ago I have seen a movie, but I think I must've been around 10 years old then so I don't remember too much about it.

What I do remember is the following:
it's about 2 (or more) children with strange powers, i remember a girl and a boy.
The girl has healing or protecting powers and the boy can take over people's minds.

the girl has been in a airplane crash and she has survived together with a woman who was in the same chair, that chair stayed complete. the boy is captured by some men and they force him to take over people for them.

I'm 80% sure that all this happend in this movie if you know a movie in wich most of this is correct plz say so :)

[Carl]

"Return From Witch Mountain" (1978) comes close to your description with the exception of the airplane crash.  In this movie I'm citing we have a brother and a sister both of whom have psychic powers.  The boy is captured by some men who wants to use the boy's power for their criminal use and the sister with help from some of the area children  is using her powers in trying to find and rescue her brother.

http://www.imdb.com/title/tt0078158/

[akatemple]

It sounds like The Fury (1978) - I have not seen this in many years and I don't remember if there is a plane crash or anything but the boy does get captured by some government agency and they force him to do stuff.

[Movie-Knut]

Is it 'Sole Survivor' (2000)?

http://www.imdb.com/title/tt0214373/