Unfortunately, I confess, I've been worried about what will be down the road, when my dad passes away. A wise friend advised me to stay detached when toxic sister begins to spew and simply state "let's get through with what needs to be done. I don't want to talk about our relationship - just know I wish you well." And leave it at that. I pray I'm strong and calm enough to do that.
Thank you all for sharing your thoughts.