I want to find my half brother and my dad. where do i look? i dont want to pay anything.?

my mom and dad divorced when i was 2 or 3. i haven't seen him since. his name is Norman Chavis. i think. i also want to find my half brother. his name is Christopher Antonio Fields i have all of his information. i have tried to find him everywhere, no luck. the only free places are facebook and myspace but there are like a gazillion matches. and i don't want to pay anything, i don't want my mother knowing im doing this. so if yall have any websites i can go to that is free. please let me know. or if you know these ppl. im dieing here lol : ) thanxx. <3