I have a holiday cottage which does not allow children under 12. This is for health and safety reasons (think steep stairs, pond, open and functioning fireplace etc). It says on the listing at three different points on the listing page that children under 12 are not allowed. This includes babes in arms. It also makes it clear when you book (i.e. once you've selected dates and you get through to payment) that children are not allowed. There is literally no way this can be missed.
I had a phone call from a neighbour this morning as they had seen a toddler in the garden and had noticed that the car that the 'couple' arrived in has a baby-seat in it. I rang the cottage company before lunch and received a rather passive response that made it clear they didn't want the grief of turfing the family out. I was very firm and said I wanted them out by the end of the day. Long story short they are still there (I have texted said neighbour to check).
So here is my AIBU: would I be completely unreasonable to send a relative tomorrow to boot them out if they are still there? As it's all done through the cottage company I have no way of getting in touch with them myself, so either relying on the ineffectual cottage company or sending a relative are my only choices.
YABU: Let it go, the child hasn't been injured so far and it's only four more nights.
YANBU: They're cheeky fucks and you should boot them out even if the holiday cottage company isn't going to help. Then you should find a new holiday cottage company to list through.