I had a similar situation happen;it was suppose to be just a person coming for a few days apparently to look for a place as he was relocating and that's all good,but arrivng later than was posted was one thing and yes partly was due to weather,there was his girlfriend and child in the car who couldn't go back to their home due to weather conditions and the other reason they said was a nearby hotel was way overpriced,so I let them come in,but one night ended up to be three and they had a dog which of course couldn't leave in the car,so we had no choice but to let them bring it in even though we had cats and a small dog ourselves;what we didn't care for and do understand about children,we raised our own,was them basically coming down and helping themselves to whatever all hours of the night and then becoming quite bold with us
now I'm not saying I don't mind extra people,but it'd be nice to have a little notice and not show up close to midnight