I was invited to my brother’s wedding, but he didn’t invite my mother because he still has a petty grudge against her, and he obviously wants to turn me against my mother.

I did not tell my co-workers about the wedding. I didn’t even WANT to bring the subject up. But my co-workers know my brother very well, and they REALLY want me to go to my brother’s wedding. I told them “Let me check my schedule” because I don’t want to talk to them about my family drama, but they told me “You have to go. You want to see them walking your nephew, right?”

What am I supposed to do? How am I supposed to avoid this conversation? How can I tell them I’m not going without creating drama?