We didnt do a pregnancy announcement or gender reveal on FB (just a baby reveal when she was about a week old) so I have no advice on that front, but I did want to say I'm sorry you are dealing with some gender disappointment in the family. We had that too. When we told DH's grandfather we were having a girl, his response was "Nooooo! What is wrong with you?!". He quickly followed up with congratulations, so I think his daughter gave him a look (it was on the phone). My BIL has three girls and is done. We now have the 4th granddaughter and FIL and GFIL are desperate for boys. I'm still hurt by their responses.