Moi, it sounds like you don't know how to say no. You have taken responsibility far beyond your own life. It sounds like your whole family has gone through a lot of turmoil with your mothers illness.
Is moving out an option? Living on campus will be a heck of a lot better than living with your family, and it has a way of improving sibling relationships.
Take care of yourself, be a kind and good example, but know that at some point, your family will have to fend for itself. If your sister dosn't want to change, there's not much you can do about it.
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