Accidentally called a woman’s husband her brother on my first day at work turns out I wasn’t totally wrong

So today was my first day at a new job, and during lunch, I was sitting with a group of new coworkers. Everyone was chatting except one woman who was mostly quiet.

Midway through, a guy walked in and handed her lunch. They looked a lot alike same features, same vibe so without thinking, I smiled and said, “Oh! Is that your brother?”

They both stared at me like I’d grown a second head. Then they just walked away.

The rest of the table burst into laughter, saying things like, “I can’t believe you asked that!” and “Wait, who told you?!”

I was beyond confused. I explained that they looked so similar, I just assumed they were siblings.

That’s when I was told: they are adopted siblings. And also married.

I went pale.

Apparently, they were raised together as siblings, but didn’t find out they were both adopted until he was 11 and she was 14. Still, they grew up in the same house. And now they’re married.

I have no idea whether I should apologize or just never mention it again. I didn’t mean any harm it was just a wild coincidence based on how much they look alike.

Also, side note I didn’t expect so many people defending the whole situation. Maybe it’s just the way I was raised, but wow. I’m still processing.