This is r/that happened karma farming for almost sure.

The odds that the sister "doesn't care" most of the time, other than for a niece she rarely sees dressing up as a nephew for her wedding day? Yeah right. The kids aren't even in the wedding, and the odds that a "usually whatever" person suddenly cares about what name a table at a wedding has and whether a guest is wearing a suit or a dress? Not terribly likely tbh.

Oh and it's a poor single father of three who lost the wife when the kids were toddlers, in case you didn't know who to feel sorry for? Oh and ALSO this karen is 38 which is a little old to get married because we totally need to know that she's a middle aged woman so you can feel guilt free in hating her for a one sided story.

And the entire wedding guest list clapped for alberta einstein on the way out.

I've been IN and helped with so many weddings at this point it's a rare day in hell the bridge or groom has any ability/attention span/patience left to deal with anything that ISN'T dead central to the event, much less if it's a "formal and well organized" wedding as this one is.

more likely - sister gave no fucks and put the other name on the card not really thinking about it without half this drama and dad decided to make a scene and she was like whatever then go.