This weekend we had four other couples, all old friends, round to eat and to celebrate various things and catch up after the summer. We all have teens of various ages. I said it was going to be grown-ups only so it wasn't too unwieldy/expensive and we could chat freely, relax and enjoy some nice food and wine. My DC were very happy with this and they planned a sleepover elsewhere. Childcare/other arrangements made by the other families (or so I thought).
On the evening we were all having a great time, and then halfway through dinner one couple's older two teens turned up. We were surprised but said hi, how are you, lovely to see you etc and expected them to just be popping in for a few minutes (they said they were on their way out to a party) BUT they basically joined us, ended up staying for hours, eating and drinking, a bit of 'holding court' going on, and it just completely changed the dynamic as they were so dominant - it stopped being a grown-up conversation. They are lovely kids but it was not the evening I had planned.
Their parents completely indulged and encouraged this (it's not the first time this kind of thing has happened, now I think about it, they seem to think their kids are 'special' and adults-only boundaries don't apply to them) and didn't say anything. Eventually DH gently suggested it was time for them to go so we could get back to the adult chat, but it was a bit awkward.
AIBU to think our friends and the teens should have understood that a grown-up evening doesn't include anyone's children?