Duke Gadd's mother is not happy with Corey Feldman... 'cause the coroner hasn't ruled on her son's death yet -- so, she doesn't know how "Dr. Corey" can tell everyone he knows how Duke died.

My father hired this man and this man ... and he was molested by numerous men but wasn't raped. Feldman also says his close friend Corey Haim was sexually abused. They were two of the biggest ...