Hello Nat - I know what you're saying. I have two young boys, one with autism and the other who was borderline ADHD. Disclipline and firm kindness is the key. I've never used the "naughty step", but removing favourite toys and then returning them for good behaviour is one way of eventually making yourself clear - i.e. - good, means being rewarded, and naughty means they pay a forfeit. However, your children are young yet, & some degree of "playing up" is quite natural. Rudeness is another thing. They mustn't be allowed to get away with it, or the problem escalates. Refuse to answer them if they don't use their manners, and calmly explain why you're going to ignore them. It's very stressful at first, but if you keep at it, you'll see a change. x