The parents of the teen accused of
fatally shooting four people at a Michigan high school have been charged in connection with the rampage, prosecutors announced Friday. James and Jennifer Crumbley have each been charged with four counts of involuntary manslaughter.
Parents of Michigan school shooting suspect charged
I am trying to follow your reasoning here. The parents are charged with involuntary manslaughter which has nothing to do with if their son is a minor charged as an adult or a minor charged as a minor?
Involuntary manslaughter (also called criminally negligent manslaughter) occurs when a person is accidentally killed due to someone else's criminal negligence, or when someone is killed during another crime, where the intent was not to cause bodily injury or death. Unlike a murder charge, involuntary manslaughter means that a person had no intention of killing another, but due to their careless or reckless actions caused the death of a human being.
Michigan Involuntary Manslaughter Law - FindLaw
Their neglect of their son's issues and the threat he posed, their purchasing and making a available to him a weapon, their refusal to take him from school that day after the meeting with administration about the threat/drawing, all contributed, even if it was not their intention, to the murders their son committed. but for their actions (or inactions as they case may be) those four students would not be dead. So the charges are appropriate IMO