"I used their real name"... Connor is their real name you ignorant biscuit.

AITA.... No, there's another 4 letter initialisation "HERO" : stands for He's Everything Relatives Ought-to-be. Or just "dad"

I am a big fan of using an air horn if someone insists on continuing to misgender or dead-name my son. It only takes a few blasts and they either get on board or get out of our lives. I’m ok with either result.

The world needs more Dads like this guy.

If you had had the gift of prophecy and known your sister was going to be an AH, you and your boys could have made her head explode by all wearing sundresses.

His son will never forget his support. He has his son’s back no matter what. This will give him so much strength in years to come. They don’t need that sister if she won’t show respect.

Even if this didn't involved a trans person, I still can't understand why you'd expect to tell someone else what to wear.

What a weird thing for her to fixate on on her wedding day. I wonder why it was so important to her to use the child's birth name. Seems like she should have much more important things to worry about.

NTA - great dad. What a shitty sister.

i wish more people were like this amazing dad.

Absolutely not. If she can't even muster the energy to use the individual's actual name, there's really not much hope for the future

Good on you to stand up for your son!

My nephew is trans and is the same age, same position (not physically transitioned) as Connor, and if somebody in my family did this, not only myself and his parents and siblings would leave, but a bunch of other people would too. And we’d be a lot ruder about it. It would be one thing if somebody didn’t know, but to know for so long and purposely deadname somebody in such a tangible, public way is despicable. Props to this awesome dad. And it bears mentioning that as long as they’re well dressed and the attire is appropriate to the event, EVERYBODY should get to wear what they’re comfortable in, regardless.

I don't know what it seems to be about weddings that make some people lose all sense of boundaries and common decency. Well done to the dad!

Even as someone who isn't a trans man, I would have a problem with just being told I have to wear a specific KIND of dress to attend someone's wedding. Well, ok, I'm enby, so that may be part of my issue, but even if I was cool with wearing a skirt for a beloved family member's sake, sun dresses just don't work with my body. Even just talking to the cis girls attending the wedding, there are plenty of other ways to ask someone to dress feminine and nice without needing to be so controlling. Maybe they don't own a sundress, or maybe they find them too revealing. No one should ever have to feel forced to expose more skin than they want to. That's bad. But we're not talking about the girls, we're talking about Connor. There was the thing about him being a 'man any other day'. That's not how that works, b*tch. Try telling the bride to be something that's she's not for a day. In public. Connor can't just become a woman and flop back, and saying so is about the most insensitive thing here. He or any other man could physically wear a dress, but that doesn't make him a woman. However, there is a lot more baggage and feelings for Connor to have to wear one than for some random dude to. Same with the name. Why should someone have to feel bad just to come to your wedding? As a bride, why the heck would you want that?

Maybe she should go and get some therapy or read one of those "how can I not act like a raving 4sshat" self help books.

I love this man!! He's an amazing father!!! 💜

He was way calmer than I'd have been. Id have gone complete Ghostbusters and said "There is no deadname. Only Connor" And LOUDLY announced she was a bigoted piece of trash.

Standing up for you son, now that's f*****g amazing! :) F**k your sister tho, glad her wedding's gone s**t. She did it herself, not you!

You are a wonderful dad and did what you had to. Your sister created the situation and she's the only one to blame here.

NTA. If she cannot respect you and your son, you don't have to respect her wedding. So leaving was the only option.

NTA your sister is a horrible person. She ruined her own wedding by not treating her nephew with respect

Let's play devils advocate, are you TA, yes you are. It is bothersome that everyone has to walk on eggshells around you & your kid. Your kid is trans, fabulous, don't really care which way they want to live...but really, grow a thicker skin. Not everyone is going to accept it and nor should you force the issue either. You're not some super parent, you are petty and got your little feels hurt so you took your marbles and went home. How is your kid going to survive in a world that doesn't give a s**t? You think your sister is mean, wait till the kid meets someone who is way more outspoken and "bigoted". You are not doing them any favors by shielding them from reality. Reality is, your kid is going to fight an up hill battle and you won't be there to save them every time someone speaks out against them. You totally missed the opportunity to teach the kid how to stand up and deal with the aunt face on. Instead you taught them how to be shamed and tu k their tail and run. WTG.

Here's the thing so many people don't seem to understand: you DON'T have to agree with someone, to show basic human kindness. You don't have to "agree" with homosexuality, abortion, religion, politics, or even being transgender, to be nice to someone who "does". (Using quotes because it's obviously not as simple as that agree/disagree for things like sexuality/gender/etc, but you get the gist.) That doesn't mean you have to be their best friend, or hang out with them, or take on their views. It just means you're nice to them. It means you're respectful, and polite, and don't go out of your way to hurt them. Or, if you can't do that, just live and let live. It's not difficult. After all, you're never going to agree with everyone. But we're still all human beings. Just be nice. Period.