I am trying to find the title of a movie that I saw in the late 80's early 90's. Its about a brother and sister who was being haunted by a girl who lived in their house in the late 1800's. The girl was killed trying to escape from a couple of robbers trying to steel treasure or money from her family.
The brother and sister was on a quest to solve the murder of the little girl and to find her body.

It sounds like Child of Glass (http://www.imdb.com/title/tt0077325/)

Or Mystery Mansion (1983) (http://www.imdb.com/title/tt0091587/)