I've had a somewhat similar experience with my elderly mother. She was emotionally abusive to me, and I was very scared of her. This pattern even continued into adulthood. But she has since acknowledged her abuse and even apologized. I know she did the best she could. Her parents were even more abusive to her......

I'm glad that you were able to bring this out into the open, and that your parents were able to express their remorse. Your dad might still be in a bit of denial, but it might be more of a man's way of covering up his feelings, perhaps?

It is a breakthrough, I think. As the other folks say, it does sound like you would find it helpful to run it by your T as soon as you can, since it is such a profound experience for you. Plus, it's a tough time for you, since you are dealing with your mother's decline and your dad's decision.