Is is rude to have a no kids wedding?

I made a post a while ago and asking if I am the AH by not inviting my nephews to my wedding reception but to the ceremony itself. Since my fiancé and I want a more formal adults only reception. There will be an open bar and loud music. Ther would be 21 children otherwise.

My brother cried and is devastated that I did not invite his kids.. also my parents are on his side. None of them is talking to me right now..

Is it rude in switzerland to have a no kids rule a thw reception at your wedding? AITAH? We've been already to weddings like this 4x here..