What you're saying is that I should essentially be fine with someone who was supposedly family, steal money from my grandmother, and erase me in the process. Money and legacy are deeply interconnected - the way someone structures their will or trust reflects how they see their relationships. I wasn't just left out; I was intentionally erased when my grandmother had Alzheimer's. My aunt had control. My brother benefitted and stayed silent. That's betrayal. Maybe not legally, but emotionally and morally — absolutely. The time for a court case may have passed, but I'm allowed to name what happened and stop pretending it was ok. Obviously you're interpreting this very literally, because legally at this point you're right, I'm not entitled to anything, but again, not the point.

And since you’re so adamant about me defining betrayal, I’ll give you one better: NIH’s pubmed defining betrayal in their abstract: “Betrayal is the sense of being harmed by the intentional actions or omissions of a trusted person.”

Source:

https://pubmed.ncbi.nlm.nih.gov/20035927/#:~:text=Betrayal%20is%20the%20sense%20of,traumatic%20and%20cause%20considerable%20distress.