Domestic Disturbance (2001)

Frank Morrison is a divorced father with a 12-year-old son, Danny. His ex-wife Susan and son Danny now live with Rick Barnes, Susan's new husband. Danny, who has a reputation for telling lies, accuses his stepfather of committing a murder. Initially, no one believes his accusations, but then Frank becomes convinced and is the only one who believes him. Now, the father Danny trusts must protect him from the stepfather he fears.