Because they will come up with all sorts of reasons shy they won't. Their arm/leg/ear/tooth hurts. They didn't make the mess so why should they clear u. They will only do it if I do X or they can do X. I keep telling them if they helped more I would have more time to do things with them. They keep asking for pocket money but tbh we have no idea how much to give them and can't afford much at all.