(What would you or your spouse do if...) you found out you had a child you didn't know about, or your spouse had a child you didn't know about?

I know, I know, it's the stuff of Maury Povich, or Jerry Springer, or the soap operas on TV, the stuff of romance novels, made for TV movies on channels such as Lifetime and such, but what would you really do?

As a person that grew up in a time when, shall we say, love was more free, and sexually transmitted diseases weren't as prevalent, or at least the ones that were (known) out there weren't as likely to be apparent death sentences,  I think about a time when I was with someone long before I was ever with my spouse.  I think of the unprotected encounters, and an actual "scare" when my partner told me she "missed."  Though she had told me she couldn't get pregnant, miracles do happen (as my neice is a testament of) and sometimes people that can't get pregnant do.

Years have passed since I broke off with that partner, and -- to the best of my knowledge -- she wasn't pregnant and we didn't break up in one of those 'once more for old times sake' manners, but... she could well have ended things with me while still carrying a child that I would not have known about.  We were youngsters ourselves, still in school, doing what youth in the 70s did as they got older and hormones raged.

I wonder sometimes what I'd do if there ever came a knock on the door and on the other side stood someone that looked like me, but whom I'd never have seen.  Further, just what would my wife say about it?  Though she knows my history (for the most part) and I know hers (again, for the most part),  it would be a shock I'm sure.

How would something like this impact you?