how to/should I contact my dad?

my current dad is my stepfather and he adopted me so I would have his last name. But my(I wanna say real dad but I dont know if those are the right words) dad’s name was different. I dont know a whole lot I just know he was in prison when I was born for commiting murder. I dont know when he got out or how old I was. I know that I would go see him on week ends and I would wait by the window at my grandmas till he would pick me up for the weekend and half the time he did not show up. I also know he was in gangs and did drugs I dont know this for sure but its what my parents have told me. when I was adopted we tried 2 contact him so he could approve but when the police found him he said he didnt care. That kills me to think he said that. But I found out that he calls my grandma a lot to try to get ahold of me. I know that he is wanted by the police maybe FBI I am not sure I know at one point he was. but he may not be now. the reason I am asking you this is because I want to contact him. I have this feeling inside me that he has changed. (which could be complete BS) his old way of contacting me was to go to my grandparents house. which is in the Midwest thats where I was born and were he may or may not live. I just want to know if there is anywhere in the bible that could help me know weather its a good idea or would be bad. I also want your opinion. I dont know if it would be safe to see him or not and I am pretty sure that me contacting him or him contacting him is illegal till I am 18 but I dont know if hes alive or not. that question has scared me I know gangs aren’t all that safe. so if you could give me your opinion and any advice that would be helpful. If you dont mind I would rather my mom or dad not know. if I do decide to contact him I will tell them though your answers don’t have to be religious. and I would like to contact him but would imagine that would be difficult.