Herc,
Some of your sister not believe you could be denial...Could be she just doesn't want to see or hear it.
I worked for an elderly couple for 18 yrs doing their housework. She passed away, and I continued to work for him. I started seeing drastic changes, and would call his son all the time. The son would argue with me, or tell me that he had talked to his father already, and why in the hell couldn't his father just remember the shit. HELLO!!!! The son was a jerk......
His dad soon started drinking the hard stuff...Well dear old son didn't believe me. And dear old dad was drinking and driving. Nope his dad agreed he wouldn't drink and drive. OMG!!!!! Wake up you jerk, he IS drinking and driving.
I begged, pleaded, screamed and yelled to have his father placed in assisted living. He wouldn't believe me.... I called him 3 days before Xmas 2 yrs ago and said, "This is my last day, find someone else." He begged me to stay. I refused. In 2 weeks, his father was moved into assisted living, his car was taken away, and his son is still a jerk....LOL!!!!
Sometimes things just have to be shoved in others noses till they understand........
I understand what you are going through. It isn't easy. It's frustrating, and can be overwhelming at times....
Hang in there Herc....