What does Cole find out about his father’s childhood?

From the text:

She smiled sadly.“Your father isn’t a bad person, but when he was younger, he had parents who beat him for everything he did. That’s all he ever knew. When I saw him start doing it to you, I kept telling myself things would get better. Drinking helped me ignore reality.” She shook her head. “It took a divorce and you ending up in the hospital to wake me up. I realized I couldn’t change your father, but I could change me. I’m sorry you’ve gone through all you have. Can you ever forgive me?”