Thank you @RoxanneToto for your kind words and support--it means a lot!

I think it may take some time to process all of this. I spent 2 days in a strange tired heavy sad feeling. Now sometimes I am back in shock and disbelief that my parents (and sibling) seemed to have created their own very unhealthy "family" without me. It's like they made some kind of arrangement behind my back to exclude me. I've been aware of my mother's gaslighting for a few years, but this is a deeper hurt. Somehow it's like they are all not ever what they seemed. Maybe I'm seeing their true nature for the first time.
I thought my sibling was kinder than this. It's been a couple things now where sib has made plans with parents or other things and I'm just a last minute afterthought.

This might take some time to process.

Thank you for listening to all of this.