Girl, no one can change the past. But what you can do, is give them a chance. Your father and mother refuse to love you, for a long time.
You can't change that, they can't change that. "Afraid of you"? No, that's just you being a powerless nobody that was too scared to seize one big of power called a "Daughter".
So, how about this? Ask. Ask her "what do you want?" If she wants you to be her parents, okay. If she's giving you a chance to be her friends, better. But you forfeited that right to control her life when you spite her.
As for Grace... geez, flirty woman. She's more fickle that most broads.