Background: I was with him on and off for about 5 years but when I became pg with dd1 he became particularly nasty. He tried to blackmail me into aborting her by telling me he'd report me to SS and would have custody of her by the time she was three.
He also threatened to (and did eventually) tell my parents I was pregnant
. I was 21 at the time, living alone and I would assume that my parents would eventually notice I had given birth, so clearly I was not planning on keeping it secret from them. I'm not sure what he thought he'd gain from this.
His last tatic was to tell me I had to leave my home, my friends and my job and marry him and become a 'housewife' or he would have nothing more to do with me and would never see dd1, until she was three when he waas going magically gain custody of her 
Needless to say I declined his kind offer and he true to his word he has had nothing to do with dd1 and I since then.
He has not phoned or wrote to see if she was born healthy and I did not contact him. I was bullied by my parents into this, being 21, alone with a baby, suffering PND and scared witless I was easily manipulated. I'm not even sure if he knows what sex she is. He did not try and gain custody of her when she was 3. He has not paid a penny towards her upkeep.
I did email him when she was about 4 to tell him we would be explaining her parentage to her and would like to see her, but he didn't reply and deleted his FB account (where I found his email address from).
She is 8 now and has asked to contact him.
I have no idea what to do. I have always told myself that if she asks to try and make contact with him I'll go ahead and do it, but she seems so young to be rejected, which I am sure she will be. How do I explain to her that he wants nothing to do with her?
His parents know absolutely nothing about dd1. They do not even know she exists. This has always bothered me. Surely they have a right to know their first born grandchild? Do I write to them first? Do I write to him and tell him I will be writing to them?
How much say in what happens does DH get? He wants nothing to do with dd1's bio dad. He is her real dad. He has raised her since she was ten months old.
Gah! I'm so confused. Tell me what to do before my brain explodes from over thinking.