Who ever is desperately trying to find someone (father, mother, son, daughter, and etc.) here is the easy way. Briefly explain the circumstances (how the separation occurred), in which state, city, section of city, year, month, and etc. Many people were having illegal sex (one night stand) back in the 1980s and 90s, and because of this many children were born without knowing their father. I myself am looking for a possible 23 year old (as of Jan. 2014) son or daughter. I was young, virgin and very good looking, and the female that I made love to in spring of 1990 likely got pregnant and decided to give birth. I'm not sure (50/50) but it's still haunting me... in the Tora, Bible, and the Quran, God clearly says to avoid sex outside of marriage. I repent for doing this sin and as you can see what it causes.
Btw, these days you can find just about anyone on the internet. You just have to know what you're doing, everything is possible. I found someone recently that would've been impossible 10 years ago. It was a child who I just said hi to in an airplane 30 years ago, I didn't know her name or anything except approximate age, her race, and from where to where her family were going. Hahaha.