Whose fault is it

My mom is super neglectful and super busy and she never pays attention to me and my sister and whenever i try to pay ettention to my sister she gets angry. When she was little i was checking if she is watching dumb stuff on the internet, she got andgry and forbid me to do that bc im not her mom, even though she doesnt check what shes doing either, years later she has trauma from the internet an it is somehow not her fault. My sister doesnt eat anything our mom always made us food but in the recent years she has been very busy so she stopped and told us to make our own breakfast and she makes lunch (which should be like that anyway). I made breakfast for myself but my sister didnt wanna do anything, so after seeing her not take any food i started making her food, but then i stopped bc i think shee needs to take food on her own. And ofc when i stopped she stopped eating. She doesnt wanna prepare anything ever. Her excuse is always that when i was her age i didnt have to cook. She doesnt have to cook either its not that hard to make a sandwich, and also, i did. I tried to offer to make her food again and she always refuses and yells at me. She doesnt ever wanna make anything, so when out mom makes something for herself she whines so she would give it to her instead of eating it herself. She will only eat something that ddoesnt require any work or sweets. She eats ice cream for breakfast and my mom got mad at me and yelled at me bc i told her and she sayd my sister has every right to do that. She also steals my chocolate and sweets whenever i get them so i have to hide them in different hiding spots and im still afraid she will take them. She also says the reason she doesnt eat is bc i eat all the food but im very careful that there is food for everyone, unless im super hungry but even then i cant eat everything that is in the fridge. The food she can make is a sandwich with a chocolate spread, she sometimes eats cake for breakfast, chocolate, candy, chips, crackers, croissants, bagels, cupcakes, cookies, anything that doesnt require work. She never ever eats any meat, vegetables, eggs, fish or any kind of protein or anything healthy. Right now my mom my sister andi wanted to watch something and made ourselves breakfast, i made a salad and she just took crackers and cream cheese. I asked my mom why does she allow her to never eat any vegetables and meat (this isnt like "oh she just ate crackers for dinner one time" she never does eat any meat or vegetables) and both my mom and sister got very angry and yelling at me and saying stuff like "you cant tell her what to do" "you are not her mom" "why are you commenting on my/her food? "who gave you the right to comment on her/my food" "cant you mind your own business?" they could have said all of that calmly but instead they were yelling, and when i told my mom that she doesnt never ever eat meat and vegetables she said that she has the right to if she wants to and that its okay and that i have no right to tell her and when i asked my mom "shouldnt you be telling her to eat more healthy as the mom? she sometimes doesnt even eat anything" and then she immediately yelled at me "she has the right to do whatever she wantso fc im not telling her what to do its not my job she can eat and do whatever she want she has the rights its none of my business she can eat whatever she wants she doesnt have to eat what you tell her you are not her mom" and stuff like that, while my sister was yelling at the same time. They both yelled at me and immediately said some random things like "you think you are always right" "you think you can tell others what to do" "you never want to admit when you made a mistake" and then my sister said she will stop eating now and actually wont eat dinner at all and that is my fault and then they both yelled at me again. Idk what to do i aplogised a lot of times but when i told them i shouldnt have said what i said in the first place and that im sorry for saying that, but i also told them that maybe they were a little bit overreacting bc i didnt say anything that bad the got even more angry and started yelling even more. Im really sorry for what i said and i wish i didnt say anythingand im sorry if i said something mean i didnt mean to i was just worried, and yes sometimes my sister doesnt even eat anything but my mom says its none of my business. Idk what to do anymore it has happened so many times that they both team up and yell some nonsense at me at the same time and my sister starts screetching and they get angry for no reason or wont tell me the reason idk what to do anymore, i always wanna admit what i did wrong and i admit i shouldnt have said that, and i told them but they are still angry. This isnt uncommon it always happens that they both just start yelling at me sometimes randomly and sometimes wont even tell me why but most of the times i know but sometimes still i dont. Im sorry im really sorry for what i did and fro writing this but i disagree i "never admit i can make mistakes" bc i just did, i know i shouldnt have said that and im really sorry for saying that.