Could Someone Help With The Title Of This Film?

We believe the film was made in the mid to late 1990's. It is about fraternal twins, a boy who is in a mental hospital because he seems unable to speak and his sister who has deformed hands, her father, who we think is a doctor, is trying to replace her hands by killing young people, he might be luring his victims by using an ice cream truck. The sister is kept in a basement near her dead mother's prized piano. The brother draws hands on every surface of his hospital room trying to tell what his deranged father is doing. A woman, either a police office or psychologist is trying to help the brother to unlock the mystery to his silence and the recent murders where only the young victims hands were cut off. It's a murder/mystery/horror type of film and might, just might have been made for television. It's driving me and my sister crazy, please help. Thanks. :-)