Maybe not an AIBU, more a what would you do...
Bit of background info - in my younger days I was very good friends with a couple of sisters. We went to gigs, clubs and pubs together also went on holidays. Over the years we lost touch, had our own lives to live but found and friended each other on fb. They both emigrated to NZ. Didn't have much contact on fb but occasionally liked posts and wished happy birthday.
It would appear one of the sisters has passed away. Nothing has been announced on fb and I only know because it was her birthday a couple of weeks ago and some people obviously did know because they were wishing her a happy heavenly birthday - her son also wished her happy birthday and said he wished she was there.
Normally, I would of course message and send my heart felt condolences but... it's the fact nobody has made an official announcement on fb - I'm wondering if I should just say nothing?
My brother passed recently and if someone messaged me, I would be comforted by their concern but, not sure in this instance. Would I be unreasonable to message her?