The father of a school shooter in Michigan has been found guilty of involuntary manslaughter in a case that created headlines across the United States for seeking to find a parent criminally responsible for the actions of their child.James Crumbley, 47, is the father of Ethan Crumbley, a 15-year-old boy who took a gun from home and killed four students at Oxford high school on 30 November 2021.In February, Ethan’s mother, Jennifer Crumbley, was found guilty of involuntary manslaughter, raising the prospects that parents of future school shooters will also face trial in American…