I am not the child of adoption, however, my father was unpresent in our lives (my sister an myself). He was abusive and my mother divorced him because he was a danger, so naturally, she didn't want us to have anything to do with him either. The only role he was supposed to play was paying child suppor, which he didn't.We never knew him. I don't want to know him and am glad that we don't.
They were both very young when they got married but my mom did her job, he didn't. And for what he did to my mom, I wouldn't want to know him.
Our lives are MUCH better off wothout him, I'm sure of that.