Why?

The day after I wrote the previous post, my sister relayed a conversation she’d had with our mother which was so unlike my conversation that it was like my own had never taken place.

Why does that have to happen?  My sister was hurt, and I don’t blame her, and it makes me angry and doubtful (again) that things are really going to change.

If your drinking has hurt one daughter, you can damn well bet it’s hurt the other daughter, so you are going to need to address that with BOTH of them.  Regardless of anything else – your drinking has hurt us both, mom, and you need to deal with THAT right now.  With both of us.