Ok i need help...lets say theres this boy, and his mom is mentally insane....?

im gonna write this as if i were writing a story okay? theres this boy, hes 16 years old, his mother put him in a mental hospital 3 times for stuff she made up. every single day she screams and yells at him for the littlest things possible. his mother and father are divorced, father lives in florida, both this boy and mother live in north carolina. his mother has MS and seems to be getting worse with her memory and anger every day, if one day, the screaming got so bad, the boy decided to call 911, what would happen? if she was taken away to a mental hospital or arrested for abuse, where would the boy go? this is a serious senario because it is happening right now with my bf...please serious answers.