Something very similar happened here in Sonoma County. An older teenager with mental issues took his younger brother hostage in the back of the family car (they were in the process of trying to cart the older brother off to get help for his mental issues, and he freaked out). The parents called the Sheriff’s dept. The younger kid was released . . . but the deputies couldn’t get the older kid out of the car, and ended up shooting him when one *claimed* the kid went for his gun. (Much dispute about what really happened.)
Most deputies and cops are not prepared to deal with the mentally ill. Don’t call the cops on a loved one unless it really is life or death and you’re prepared for your loved one to buy it.
This is one of the BIGGEST problems with American police:
The confrontation never ends until someone gets shot to their satisfaction.
Leave the kid in the car. He'll get tired of it. Nope - the "brave defenders" have to go at him like a pack of hounds on a treed coon. They're TRAINED to do this.