My wife's relatives usually come to sleep over and i am always in the dark as to them coming over. I will go home in the evening from work and find them at my place. My brothers on the other hand would never come to my place unless there is a function, we always meet in a pub. I guess it all boils down to how one is brought up. I am planning to put a stop to this as i cannot have my kids sharing beds because of an aunt or cousin even if it's for a day or two.