I feel for you Frank...I lost my dad last year. His illness was prolonged and it was painful to watch since we all knew the outcome. It devastated me and my siblings. Dad was our rock. Mom is still alive but as the years go on and we all get older the inevitable is just ahead. Thank God for our siblings!
You have extra weight on your shoulders with your sister. I couldn't even imagine how hard it would be to take care of her. Just take one day at a time. Take a few deep breaths and know that you are an angel to her. I hope you visit here often and get back to your normalcy in life and leather work.