I have a relative that was obviously gay from a young age. So we all knew and just assumed it was ‘open’, but of course never had any specific reason to reference it with him, just like you have no reason to discuss being straight with a straight relative if that makes sense.
Anyway, at one point they asked all family to meet as they had a big announcement. They were known for being quite ‘dramatic’. We all assumed he had aggressive cancer and was palliative or something drastic. He announced he was gay. We all sat there confused looking at each other because we had all known that for over 20 years. He then got pissed off as we all sat there going ‘yep, and’.
When he returned from flouncing off, we all tried to play along. His mum [again, who knew he was gay, and if someone ever asked if her son was married, as was pre-gay marriage days, would say ‘no, x is gay’] said ‘how long have you known you were gay?’. He said since childhood. And we all sat there and thought, right so we all knew at the same time then. Was so so weird. We’d even met what we assumed to be boyfriends in the past, but just like if you are straight you don’t go ‘this is my platonic friend/co worker/boyfriend/partner, Rob’, you say ‘hi everyone, this is Rob’.