From Bearing Arms:

A Michigan judge went beyond the recommended guidelines on Tuesday when deciding how long James and Jennifer Crumbley will spend behind bars after being convicted for involuntary manslaughter in connection with the shooting at Oxford High School in Oxford, Michigan in November, 2021. The parents of the shooter will spend the next decade in prison before they’re eligible for parole, and could serve fifteen years in custody on the involuntary manslaughter charges, though sentencing guidelines suggested a seven-year sentence was more appropriate. 

The sentence isn’t a deterrent for the Crumbleys or for the actual perpetrator of the attack at Oxford High. Their kid is already going to spend the rest of his life in prison for killing four students and injuring seven other students and staff. This is about sending a message to other gun-owning parents.