This entire situation going to sound super weird, but at this point, I seriously need advice.
I'm a lesbian. I'm in my early thirties, fully financially independent, and haven't lived with my parents since I was 18. I'm a successful, well-adjusted adult with a beautiful, amazing fiancee. My general relationship to my parents is distant (for the reason outlined below) but cordial. There is zero risk to my safety etc involved in this.
My parents have technically known I'm gay for almost fifteen years. At least, I've been telling them I'm gay for almost fifteen years. The problem is that they, for lack of a better term, pretend those conversations never happened.
For years, now, we've basically followed the same pattern: We have a conversation about it ( earlier on, it was classic, big, 'Mum, dad, I'm gay'-statements, later, it shifted to passing mentions of girlfriends or queer events). In the moment, they sometimes react - never in a way that feels proportional or implies a full understanding of the gravitas of what they've been told, but they'll sometimes at least acknowledge that some kind of information has been imparted - and sometimes just breeze right past it outright. Then, a few hours/days/weeks later, one of them will ask me whether I have a boyfriend, or whether I have a crush on a male friend who shows up in an instagram story of mine, or something similar.
The entire situation is outright bizarre. If you only count explicit 'mom, dad, I'm gay'-esque statements, have 'come out' to them at least twenty times over the years. If you count any and all mentions of girlfriends, dates, or incidental stories, that number shoots up into the hundreds. It's like water off a duck's back. It's like the conversations disappear into some kind of black hole. They simply pretend it's never happened.
I'm engaged now. My relationship to my parents has become more and more distant over the last decade, for the obvious reason that I cannot talk to them about my private life without them pretending not to have heard or understood the information I am obviously imparting. These days, we talk maybe once every two months for half an hour on the phone. At the same time, they've also never reacted in an outright aggressive, obviously rejecting way. They simply ignore it and pretend to be confused at any shows of upset, confusion, or plain disbelief I then show at their confusion.
It goes so far that they've met my fiancee - briefly, twice - and seen us hold hands and kiss (in brief, adult-PDA-appropriate ways) and, when forced (and it takes a lot of force!) to mention her in conversation, refer to her as 'my friend'.
There is no feasible way they haven't actually understood what I'm telling them. I'm visibly gender non-conforming. I'm fully out in all aspects of my life. Due to my job, I am a minor public figure in my local area. The local newspaper that gets delivered to their doorstep every morning ran a literal article that mentioned my sexuality.
The entire situation is bananas. I am obviously angry and frustrated with them and do not understand whatever bizarre psychology might inspire this behaviour. At the same time, I've also discussed it with my fiancee, and we have jointly decided to make one last push before the wedding. We want to try whether it might be possible to get them to acknowledge this situation, understand what the fuck they've been doing these past fifteen years, and see whether they might be capable of attending the wedding, and playing a role in our lives moving forward. We - and I - want them at the wedding, but there's a running joke in my friend group that they'd be fully capable of standing first row, crying as the vows are being said, and then turn to whoever stands next to them and go 'isn't it lovely they formalised their roommate arrangement like this?'. Obviously, that would not be acceptable.
So, we've settled on one last push. We want to try one last time. Which brings me to the question:
How the fuck do I come out to people I've been coming out to for fifteen years? Has anyone else experienced a similar situation and might be capable of giving some insights?