Every single time we go and visit a certain relative of DH's with the kids they get about one hour into the visit before they are trying to ask when the next one will be. Every single time. They also have a habit of taking while the kids are in the room and saying we'll go to eg. Lego land next time, or stay for 3 nights instead of 1 next time. AIBU to say it's bad form and sort of implies the current visit isn't good enough?