SIL expecting, how do I not let on I know

[minniemagoo]

FIL just told us SIL and her Dh are expecting their first child. They told ILs yesterday as it was fathers day. I am pretty sure other SIL will also know as they are close.
Dh and his bro were not to be told the news. FIL in his excitement has told everyone!!!!
I am crap at not letting on. How do I look suitably surprised and delighted.
I am so thrilled. My 3 are only GCs and our baby days are over. Really looking forward to new family members (other SIL just married and ttcing so could be a bonanza).
Also aibu to think she should have told all? Since she married she spends way more time with her Dhs family but thats because they live nearer them but a phone call might have been nice.

Maybe they wanted the pleasure of telling everyone face to face.
Maybe it is still early and she wanted to minimise telling people before her 12 week scan.

Please don't start thinking badly of her/them, chances are there is no malice involved and your FIL has put his foot in it.

Either phone up and say "I hear you have some wonderful news" or keep quite for a few weeks - it probably depends on how much time you are likely to spend with them in the next little while.

Surely they aren't officially telling people yet, but wanted to let her dad know because it was Father's Day. I'd imagine they wouldn't have done if they'd known he'd tell all and sundry and basically steal their thunder!

Hopefully when they do tell you officially they'll do so over the phone, so you'll only have to make the right noises, not do the full-on gasp-in-shock-and-delight routine. Or your FIL may now admit he's told everyone and solve the problem that way.

Just don't say a word for now and go 'Wow! Congratulations!' when they do tell you