Thank you for commiserating @carolkean. Couple of things, he was on dialysis when his son took his life, but it was immediate prior to the scheduled LIVER transplant.
When his kidneys did not pick back up after the transplant, even though as far as I know the liver was working, he was trying to get on the kidney list, but with his health being so bad, that was a long shot at best.
I am also sorry for your sister's life of misery, and finally passing.
In your last line above, you mentioned the void left
One of my favorite sayings in this situation, is that:
"there is a whole in the world now, shaped like you, that no one can ever fill"
Pretty accurate if you ask me.