You mean HE knew? It's one thing to find out down the road, which is shocking enough, but much easier to understand. If your hubby has kept this a secret from you, that's not too good! He probably thought you would be upset or possibly think less of him. The fact is, he is someone's father. We all do dumb things when we're 17, and he's no different, BUT this needs to be brought up. You said you're not sure how to approach him? Just say it! Just tell him you overhead some talk about an 18 year that is his kid. Ask him why you never heard of it, ask him if he has seen him over the years, ask him if he paid child support. This doesn't have to be a mean conversation, but this is defininately something that should have been "mentioned" before you married him. He should have come clean about it. Obviously, I didn't tell my husband details about any past sex partner, but my own child? Yea, whether he played an active role in his life or not, this should have been disclosed. NOW......Since it's out on the table, I think the best advice for both of you is to be part of this person's life. They didn't do anything wrong, and deserve loving parents on both sides! (Even if the baby was adopted, there are ways to let him know you care. and he is now nearly an adult. It's never too late)