I also have just made contact with my biological father, thought I was the only one in the world to have done so, it completely throws your emotions around. I am 45 so had practically given up hope of finding him, then I got ADSL and searched the web for weeks. I casually dropped into conversation with my mother that I could look people up and she 'finally' gave me his name...then the problems started...although twice married, yet now single again, she almost fell back in love with him. She told me wonderful stories about the fantastic compassionate man he was, that he was brave and valiant..etc I felt so cheated that I could have known for all these years that he wasn't the git that ordered her to abort me. I cried so much for the man that could have been part of my life and felt so bad about not finding him sooner. She wanted me to take glamourous photos of her to email to him, she wanted us to both go and visit him, she even suggested I got a new passport (as he is foreign). She completely bamboozled what I felt was uniquely mine, to her he was her boyfriend refound, not my missing father. I exchanged photos with him, of just me and my daughter, I didnt want to tell my mum, and like you felt I was lying by keeping quiet. I told her in the end and showed her his picture, she was quite shocked at the old man he had turned into, she had kept the memory of a fit young man. Life is strange, just do what you feel comfortable with. As for the spineless reptile ex, I doubt he has the balls to face your mother and tell her something so loaded, he will be worried about her 'shooting the messenger'. He is just enjoying the power he still has to make you miserable. Tell him she knows and wants a word with him about the money he owes you, he wont go near her. I really hope it all works out, you sound nice and dont need all these other people's mistakes to bring you down.