11/12/2007 at 01:00 AM EST
Just 15 when his father was paralyzed in a riding accident, Matthew Reeve, eldest son of actor Christopher Reeve, learned early how life can change in an instant. In Hope in Motion, available on DVD, he documents the ups and downs as his dad fought to regain the use of his arms and legs. "He never gave up," says Reeve, 27, who filmed the family (his stepmother Dana, sister Alexandra, 23, and half-brother Will, 15) over a three-year period before his dad's death in 2004. (Dana died nearly 17 months later.) Although the actor's activism kept him in the public eye, "nothing has ever gone into this much detail or just let him show his feelings," Reeve says of the film. Part of the proceeds from sales benefit the Christopher and Dana Reeve Foundation.