AITA for revealing why I left home at 13 after my mom lied during my uncle's will reading?

At the reading of my uncle’s will, my mother sobbed that I had abandoned our family at 13 and manipulated him for his money. Then the attorney touched a sealed envelope marked in my uncle’s handwriting with the words: OPEN ONLY IF CAROL LIES ABOUT WHY HANNAH LEFT. I looked at my mother and said, “Careful, Mom. He kept receipts.” ---------------🦦Otter Stories🦦--------------- #reddit #stories #redditstories