Idk, sometimes shit happens and people forget about it. I have an album of pets I have had [most of them, I am missing a few pictures.] My sister and I shared pets and she cannot recall more than two of them. And these were pets we had when we were old enough to form memories.

One of those pets died in a horrible way [run over by a car, but still alive.] My dad had to brain it with a shovel. I remember it, my sister does not. I am not traumatized [though I was at nine years old for a bit] as an adult. I understand why he did it. But my sister just doesn't remember it and even when I mentioned it years later during a conversation about her dog being run over, she didn't remember at all.

Sometimes things just don't stick.