I really feel for you guys. Sounds like you've done the right thing and I find the response very strange. The timing of a child is something that has repercussions forever, and it's not just a few months they're asking you to be flexible with either.
Can you keep pushing for European cruises? That would be a suitably special way to celebrate a 50th anniversary and you could do a 7 day. Otherwise, I guess every time they point out how special it is and how they want everyone together, just counter it with how much you want to be there and suggest another Zika free destination until they get the message that going to a zika destination is not an option for your family for the next few years. There are a lot of amazing places that don't have zika. If they're set on cruises, maybe different lines? If they're set on Disney, maybe one of the dvc properties like in Hawaii? If they just want something spectacular to bring everyone together and celebrate then maybe try airbnb for private island rentals or castles (you might find fewer of those your neck of the wood though...).
Can you keep pushing for European cruises? That would be a suitably special way to celebrate a 50th anniversary and you could do a 7 day. Otherwise, I guess every time they point out how special it is and how they want everyone together, just counter it with how much you want to be there and suggest another Zika free destination until they get the message that going to a zika destination is not an option for your family for the next few years. There are a lot of amazing places that don't have zika. If they're set on cruises, maybe different lines? If they're set on Disney, maybe one of the dvc properties like in Hawaii? If they just want something spectacular to bring everyone together and celebrate then maybe try airbnb for private island rentals or castles (you might find fewer of those your neck of the wood though...).