Our neighbour's cat has adopted us. If a window is open, he will come in. He is lovely and gentle and I have no issue with him BUT I don't want him to start thinking he lives here. Obviously I'm not going to feed him, but in the warm weather I don't want to shut Windows when we're in the house. Any suggestions? My parents had cats and until recently, when she died, one of them spent more time at the neighbour's house that at my parents' house, which upset my mum. I don't want to be the cause of similar upset to my neighbour!