My family is crazazy.

My dad and my stepmom have been together for 14 years. I lived with my dad and her for 4 years. during those 4 years a lot of emotional abuse went on. This continues to haunt me. Recently my dad gf found out she was preggo. I wrote this big blog saying what she had done to me as a kid. By the way i am 20 and i have a two year old son. My dad never calls me or wants to see. my son. That makes me go crazy. But my question is should i confront my dad about the things she did to me. Or should i just keep it inside because the woman is pregnant.