How do I find my mother?

[Gary]

I'm seventeen, I haven't seen my mother since I was a little boy. I have one picture of her from a long time ago. I don't have any money. I just want to figure out how my mother's life has gone on without me. I need to know how find her somehow. My dad doesn't want anything to do with her, he doesn't talk about her nor does he want me around her. If you know of a way I could discreetly find my mom for free let me know please.