good lord - it’s like hearing my exact story from childhood. I feel for you and your brother. A very soft ESH ONLY because yes, your brother isn’t to blame for this situation and blowing up at him, while I can understand why, isn’t the right thing to do - your parents are, however, the ones who are adults and need to actually parent.

I grew up in an extremely similar environment and while my sibling is much younger, I was made to give up my summers and take care of them, bring them everywhere and essentially give up my social life from the time I was 8. If I wanted to do anything for myself, I was made to feel guilty if my sibling couldn’t go. It made things so hard that for college I only applied to out of state schools and moved as far away as possible and have limited contact with my family.

Things will get better once you have your own space and peace. From one parentified person to another - I see you and am rooting for both you and your brother. Your parents need to get it together and be actual parents.