My brother and i are trying to find our father i hav neva met him we want 3 do it without cost does ne one kno

my brother and i are trying to find out father we know his name eg first middle and last name we know his date of birth and where he was born. i have never met my father and the more years i get older the more i get upset its been 18 years now that i have not known my father and would love to find him and meet him..our mother is no help as she doesnt want us finding him does anyone know a solution we have little money and cant afford top searches can anyone suggest anything?