Hi Nancy,
Found your post really interesting as I have a similiar(ish) story myself.
I havent had any contact with my dad since I was approx 1 years old. My mother and he divorced (lived in UK) and we (mother and I) moved home to Ireland. He has never contributed financially or in any way actually and I dont know him, I've never heard from him.
He has been married before and has a few of us kids dotted around.
I've recently applied to the Salvation Army to look him up (as in last week) because I've no idea of his whereabouts. I've been half thinking of doing this for years but more seriously in the last 3 or so.
Thing is, I wouldnt have if dh hadnt sort of pushed to do it at the last minute and posted the application for me, which is a good thing because I would probably keep talking about it until it was too late and then regret my missed chance.
Anyway, the reason Im telling you this is I came to the decision to do this because, like your story, my mother has never had a good word to say about him. He was violent, unfaithful etc.. I therefore never had much interest as a teen in ever contacting him because, naturally, I took my mother's word as gospel - she was the one who had raised me and I believed whatever she said. A little older now though and like your story, have seen my mother with numerous men throughout the years - something wrong with all of them - funny isnt it? made me begin to think that heaven forbid, there were two sides to the story as surely she couldnt always be right, do you know what I mean? could this be the same?
I know shes hard to live with, so my father must have experienced this and maybe its not all his fault. She had a drink problem through most of my childhood, lots of men etc..
The difference in us is, you know that your dad had an "interest" in you at some stage so I dont think you are going to experience rejection from him, also I think it showed a maturity and regard for your well being not to approach you at 14 and to try and arrange it through your mother.
It also sounds like you have a rough idea of how to contact him so finding him wont be a problem.
I know its daunting and scary but if something should happen to him, are you going to regret not trying to start up something?