The grandchildren will miss their grandmother. Yes, my sister will no doubt miss my mother, but will only realize her foolish actions of the last 10 years, after she has lost her mother.
There is nothing more that I can do to try and get her to see that her own actions are going to crush her in the end. My sister refuses to listen to me or even reason for that fact.
I spent 20+ years trying to keep them together, so our family does not end up like the past generations. Well, I stopped that fight, the day I disowned my sister. So much for reconciling family. I was fighting against my mother and my sister, trying to point out to them both that they were repeating history.
When my mother finally realized it, she sank into a depression and ever since, realize the truth of the matter. She has now accepted.