I am so happy for you that your sibs have been so supportive by participating financially in their mother's care during this time! They have helped to carry the stress up, up and away. It's a good thing!
You know we can't control or change some things. Those strokes are so sneaky and hindsight is so 20/20 - you are not alone in your feelings of guilt if that helps... I guess it is part of our care-giving experience and our bond with one another. If, somehow, we can help another to not go through the same pain - it will help us heal... Bless You, Barb!
Love and Hugs from Glenda