I think it is wonderful that you look after your parents. It shows how much compassion you have for others. I use to work as a health care aid in senior's homes and apartments. Some children couldn't care a less about their parents health and some were wonderful. I saw all kinds of situations while working in that field.
I don't have an ideal family so I know what it is like. Unfortunately you won't be able to change your sister's views/attitudes they have to see to it themselves.
If you are finding looking after your parents is stressing you at times do you have gov't agencies that have health care aids that can come into your home, apartment to give you some relief? I know when I worked in seniors home, apartments it was to give the families a break. Anywhere from 1 hour to 8 hours depending on what the parents and caregivers wanted. Caregiving can be stressful at times even though you want to be there for your parents as much as possible.
I hope this helped! Please keep us updated. Were here for you.
