My local library is hosting a free half term session for over fours. I understand that they need to make sure the participants are old enough. I wd like dd, 4, to go. However they say they will not let her take part if i turn up with her 15 mnth brother. It will be taking place in a public part of the library and obviously dd wd go sit nr storytelller and i wd hang back with other parents and keep little one on lap and make sure he does not disrupt session but this is not good enough. This seems bonkers to me but aibu?