Amy,
I'm so sorry about your sister's setback. I think we forget that other health issues can occur when your dealing w/cancer. I hope the surgery goes OK and she recovers quickly. Does your sister know what's going on? I seen from your other thread that her short term memory and speech is very bad. Sounds like my dad and sometimes he gets angry with me because I think he doesn't know something, but he really does and I just didn't make the right guess.
I really feel these boards help me as a caregiver and also just to sort out the feelings that you have watching a loved one suffer through this. I hope your other sister does join in.
Again, I'm sorry your sister had to endure another surgery. My thoughts are with you and your family.
Jill