Can they say why they don't want to wear their coats when they are moaning it is cold? If it's some kind of sensory issue then maybe that can be sorted. If it is a power struggle, then giving as little attention as possible to the behaviour, but calmly enforcing the rules you want is the way to go. If when they moan it is cold, do you go home/back inside? Unless it's particularly freezing, do you let them experience being cold? There's clearly some kind of pay-off for them in this behaviour. A shrug of the shoulders and "Oh well that's your choice but it's a shame we can't do X because your clothes are not suitable" then walking away can often work, if it's not a sensory issue. It rather sounds as though there are different expectations from you and their parents. Intermittent reward (i.e giving them what they want sometimes) is one of the best ways of prolonging an unwanted behaviour. That's why children pester - they think if it's worked before. it might well work again. Positive reinforcement, such as a sticker chart on which positive actions can be recorded can sometimes help, but I don't advocate big rewards. Maybe something like - If you wear you coat when we go out , three times in a row, you can choose an extra story/game.
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Thanks for your suggestions so far, some great tips. Putting them in the washing machine or basket would be great but they want to wear the clothes to bed as well! Thankfully I'm not there then. I have used the I'm counting to 10 or I'll choose method. It has mixed results I must say. I've got them to agree to wear a vest and long sleeves in cold weather now (last year they often would only agree to t-shirts) and everywhere we go, their coats go too! It's just such hard work and you can't take them anywhere nice out of doors this time of year when they refuse to wear their coats. They start moaning they're cold but still refuse!
Excellent Nelliemoser!