DH and I told my dad this past Saturday, as a "happy birthday". My dad lives in California, so it was just over the phone but he is BEYOND happy for a second grandbaby.
We decided that we will now tell MIL because we know she can keep quiet until we are ready to finish announcing. Our first appointment is Thursday afternoon, they will do an ultrasound and print off a few pictures. We are going to dinner with MIL that night and I was thinking of putting an ultrasound pic. in a card, and writing something like "Congrats on grandbaby #2 coming in June 2012"
What do you think? Or does anyone have any other ideas?