I'm trying to work it out. I went to a carol service on Christmas Eve. Church packed. I kept my kids with me. Mum A's kids were allowed to roam free. They were up by the choir, chatting and laughing. One child made animal noises during a solo. They were pulling faces and sort of wrestling about. One child was actually grabbed by one of the choir at one point to stop them messing about. Two of the kids climbed over the prayer rail and were playing behind the altar. You could see the choir were getting upset. Mum B is spitting tacks about the whole thing, saying it was totally disrespectful. I thought it was pretty awful, but I don't know what's "normal" for these carol services nowadays. When I was a kid in church, we sat in silence and it just wasn't even a question. I would say this was a fairly traditional service, usually very beautiful and tranquil. The choir work hard to rehearse. I suppose the AIBU is was Mum A reasonable to let the kids mess about?