u/Mammoth_Influence690

I’m a 30F. 5 of us siblings. 4 girls 1 boy. I’m the second oldest. Oldest sister is 32 and married with 3kids, stay at home mom. She always has to have it her way and gets upset if she doesn’t. Parents won’t say anything. Last family function she wanted a certain dish but can’t cook so she said she’ll provide the ingredients and do all the prep. I get back home from work and it’s my mom doing all the prep work and the cooking and that delays the dinner (my mom also works an 8hr job). She also mistreats our house by never cleaning up after herself but yet at her house she keeps it clean and tells her kids to not make a mess. Lastly, she never asks us if we’re free to watch her kids and will always drop them off without notice. I’ve confronted her multiple times yet she continues to act this way. What should I do?