He is charged as an adult with attempted aggravated murder and aggravated arson for the October fire in Liberty Township, north of Cincinnati. The judge ruled on his competency Wednesday.
Defense attorney Brad Kraemer has entered a plea of not guilty by reason of insanity for the teenager.
Deputies said the father injured his leg jumping out of a window, and his wife was treated for smoke inhalation. Authorities said the teen apparently was upset his laptop computer was taken away.
The Associated Press isn’t identifying the teen or his family because of his age.