DH and I have just found out that we're having our first baby and were keen to let our parents in on our fantastic news. When we told DH's mum and dad, I felt quite upset at their reaction, if you can call it that. The thing is, they didn't seem to react at all. If you'd have walked into the room just after we'd broken the news, you wouldn't have known at all that we'd announced anything. It was quite bizarre. DH and I continued on chatting, more to fill the awkward silence than anything. We didn't even get a 'congratulations' out of them...even my boss did that much! 
They aren't very emotional people, but for this announcement I did expect something along the lines of 'we're really happy for you' at least! AIBU to expect a bit of a fuss from our nearest and dearest (esp the future grandparents about their first grandchild?) Has anyone else had the same sort of reaction from their families/in laws??