My family was recently invited to my brother’s wedding: me, my husband, our daughter (21), and our son (18). The only one not invited was our youngest son, who’s 16, because the event was labeled as “child-free.”

I called my brother to confirm, since I’ve been to child-free weddings before where teens over 13 were allowed. I explained that my 16-year-old is mature and wouldn’t require supervision like a young child.

My brother was very apologetic but said he couldn’t make an exception—he has friends with younger kids and didn’t want to seem unfair by only allowing my son. I accepted that; I understand child-free weddings, and I even had one myself before having kids.

He has two teens from a previous marriage (16 and 17), and two of my sister’s kids (13 and 15), so I assumed none of them were invited either.

The wedding is abroad, and we were all planning to fly out for the weekend. My 16-year-old was disappointed, especially since he and my brother are close. I didn’t want to leave him home alone, so I suggested he hang out at the hotel with his cousins during the wedding—swimming, ordering room service, just making a night of it. Then the next day, we’d all explore the city together.

My brother loved the idea. But when I mentioned it to my sister, she was shocked—turns out her kids had been invited. She had confirmed with my brother, who told her the wedding was child-free under 13, not 18.

We both called him, and he admitted that my 16-year-old was the only under-18 family member not invited. He wouldn’t say why, despite my repeated asking.

Now, both my sister and I are hurt. She decided not to attend the wedding because she loves my son and felt this exclusion was unfair. I also decided not to go.

Our mom says we’re being childish and unsupportive, and my brother’s fiancée is upset, saying my brother is heartbroken and that there’s a “good reason” for excluding my son—though no one will explain what that reason is.

My sister’s husband is angry and blames me for my sister pulling out. Now I’m feeling guilty and wondering if I made things worse. But did I really do something wrong?