I can understand why you are upset, but they clearly didn't want a fuss and probably had no idea that you or anyone else would be upset by this. That said, if I were in your position, I would limit my response to a very hearty (feigned if necessary) 'congratulations'. If they wanted such a low-key wedding, I doubt they want or expect any more. I certainly wouldn't feel inclined to host any kind of celebratory get-together, however small or informal. But that's just me!
What medical conditions seem more common now than when you were growing up?
Am I being taken for granted, or is this just what being a grandparent is today?

