In the latest Pixar release, “The Good Dinosaur,” little Arlo’s dad is dramatically washed away by a raging river. And Arlo isn’t the only animated hero to lose a family member in the film’s first act. The protagonist in last year’s “Big Hero 6” loses his brother in an explosion. Then, there’s Nemo, whose mom is eaten by a barracuda in the opening minutes of “Finding Nemo.” In “Frozen,” Anna and Elsa’s parents are lost at sea. And, who can forget the heartbreak of “Bambi,” when a shotgun blast kills the little deer’s mother. There’s a lot of death in animated movies for kids. In fact, research has found that main characters in these films are more than twice as likely to suffer traumatic death than in dramas aimed at adults. What’s a parent to do? It’s not that cartoons are trying to scare young viewers. Death of a parent is often used as a dramatic device to focus on the young protagonist, says University of Ottawa professor Ian Colman, who conducted a study on the subjec...