Usually when an adoptee is searching for their biology, they search for the birth mother. We have to remember there is also a birth father out there somewhere. Hopefully the birth mother will be able to reveal that information once she is found.
I often wonder if this is the reason birth mothers sometimes don't want to be found; they don't want to, can't or won't reveal who the birth father is. Again, there is that element of secrecy. As Troy Dunn says at the beginning of his show The Locator; "you can't find peace until you find all of the pieces."
Just as I think birth mothers should be more active in locating the children they give up for adoption, I also think birth fathers (who are aware of the child) should come forth as well.
Step up birth fathers. Reveal Yourselves.