Yes, indeed. The well-kept secret that a child was on the way in our household was kept by all involved in the hijinx. The range of responses was quite interesting.
Father-in-law..........Didn't say much, but you couldn't wipe the grin off his face for the entire evening.
Mother-in-law..........Actual quote after unwrapping the framed ultrasound picture...."So who's baby is this?". Wife pointed at herself. Initially, she appeared a bit in shock. After about 10-15 minutes of her saying, "This is so exciting", the water works finally began.
Father.........Knew right away once he took the bubble wrap off the frame. The smile gave that away (this response appeared to be common amongst the soon-to-be grandpas).
Mother..........Opened the box and we had to get her to take the bubble wrap off the frame. After removing the bubble wrap and admiring the frame, her first comment was, "What a beautiful frame......We'll have to find a good picture to put in it!". After the mention that there was a picture already in it, the lightbulb quickly came on.
So, in summary.......
--The fathers just smiled.
--The mothers both needed some help catching on to the surprise, but were extremely excited once they figured it out.
In addition, my favorite brother-in-law received a large amount of flak for keeping the secret from his wife (also my sister). I would state that my brother-in-law had proven his loyalty to me in all regards. If anyone needs a lawyer who can keep all situations confidential, I would recommend my brother-in-law in a heartbeat. The guy is like a lockbox. He's not a bad lawyer either.