Well, I got the courage, and I sent the email to S22's bio dad. It has been a long time coming. I don't know what will happen next, or if he'll reply, but it will be what it will be. I know it was the right thing.
Now we wait.....
Me 47 Ex H 46 Bomb 9/02 D final 3/04 Ex H now married to OW
------------ This is surviving. There is no such thing as a normal life, there's just life. So get on with it and enjoy it!