I need to findmy biological father for free

Unless your mother knows who it is and has paternity papers, you'll not be able to just find out for free.

I agree that you probably won't find him for free. How much information do you have? I found my bilogical father when I was 21 by using USsearch. It took quite a while because he is a musician and uses an alias... but they found him through magazine subscriptions. Good luck!

Good Luck, try posting images of him or try asking around your family and see if they can give any help.