 When the youngest child, Teddy, lets his balloon fly away, his father, Steve, gives him the balloon that belongs to his older brother, Charlie (Joel Palmer).When the boys' mother, Maggie (Helene Clarkson), is in the bathroom, the strap in Teddy's stroller comes undone.Teddy follows the balloon floating under its own power out of the restroom and onto the tracks of the park's tour train, leading to him getting killed by the train.