I had a lot of troubles with my parents, I got a lot of mental hurt and physical hurt, traumas, I got a lot of shit inside my conscience, I did things I don't like and they did things I don't like too, but I still tried to have good vibes with my family since now
Mothers sometimes are hard to handle, And I understand that from your sister and you, but u guys need to respect and she needs to understand and respect u guy too, try to talk with her and calm the situation, never let ur mother cry and then act like u don't have feelings about it, you guys are too young, but believe me, when u grow up u will understand a lot of things and that feeling of making cry a member of your family like ur mom is something that will follow you your whole life, and it is like a trauma