An Aunt or An Uncle?

I ran into a distant acquaintance the other day, a very nice young lady who informed me that she'd gotten married recently. In the midst of my congratulations, another parent -- a Dad --overheard the good news and added his well wishes to mine.

Our mutual acquaintance then informed us that she's also very excited that her sibling is expecting a new baby soon... the first of the next generation in her family. When the Dad inquired, "do you know if it's a boy or a girl?" our excited acquaintance said...

"No, the new parents want it to be a surprise so I'll have to wait to see if I'm going to be an aunt or an uncle!"

[indiscernible pause accompanied by dually-furrowed brows... his and mine]

And with a genuine smile I quickly recouped and said, "Don't you just love a good surprise?"