Is it normal that my sister screams and shouts at my parents
So heres the thing, for like 2-3 times a week my sister and my mom would fight, and I call it a fight but its really just my sister just screaming at my mom and crying. Shes turning 13 soon and I'm wondering if its just puberty or not. The thing is the issue is so prevelant that we had cops called on us at least twice from our neighbours due to either noise complaints or because they thought somebody was in distress. Theres no violence coming from my parents, and its usually my sister who hits and throws stuff in anger. We wonder if its something to do with my parents treating her like a princess from a very young age and never getting mad at her or scolding her, but the issue may be more complex then that. I'm also worried for her mental health as shes stuck in her room for 90% of the day and won't even join us for dinner. If one person says ONE thing that she doesn't like (and most of the times we say it unintentionally) she explodes and it lasts 20-60 minutes each time. Additionally she won't talk to anyone but my mom when shes angry and if anyone else tries to join she explodes even more. Its been like this for the last 5 years and i'm worried how this will affect my sister's future life and my mom, whos just so emotionally drained from being screamed at by her own daughter. Please, any input will help.