Family Issues Support Group
Family issues is a huge range that go from minor conflict to major misbehaviour and even abuse on the part of individual members of the family occur. Whether you feel you are in a dysfunctional family or you're dealing with a very specific issue, this is the place to talk about it and find others who might be going through the same thing.

And people who's opinion I don't value...and I don't care what they think.
I spend my time thinking and caring about the feelings in the first group. And I just push aside the second. I don't wish the second group ill will...I just have a boundary up on Myself...where I won't think about them.
Does that mean that there are people who have trashed me and "gotten away" with it? Yup. Absolutely. But it doesn't upset, anger, or bother me in the slightest. Sooner or later those people will also say the same sorts of things to others. I've seen people spend years trying to change the other person, or figure out what was wrong with them.
What I'm saying is that you can't change your Aunt. She is who she is. And if the "family" wants to go along with it...they will. Your getting upset isn't going to make it better, worse, or change it in the slightest.
It wouldn't be worth my time, but you could update posts 3-4 times a day about each visit with your grandmother. Doing so might help you win this "battle", but it's likely to just make your aunt more angry and dug in. Not your fault...but generally when people are acting like (profanity deleted) jerks...what you want is for them to move on...not stay obsessing over you.
I'd tuck the information in my back pocket, and know that whoever my aunt hates...has got a good chance of being a nice person.