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Do everything without whining, complaining or arguing. Everyone has their own jar. Start off the week with a set amount of quarters in each jar. If they are caught whining or complaining, they lose a quarter. At the end of the week, they get the money that remains.
Growth Chart! $35 - fabric growth chart (do one for each kid and give to them when they grow up)
Wish Bottle -- this is pretty and "inspiring". What if next birthday, a petition paper were placed inside a pretty corked bottle, decorated and prepared with a few drops of appropriate oils and herbs, etc. Then when making a wish, and blowing out the candles some of the lingering smoke could captured and corked into the bottle. It could be kept until the wish either comes true or shifts into a different wish. This same concept could work anytime, not just a birthday.
Book exchange party- I'm totally doing this. I think everyone should bring two books, one of any genre, and one on a theme for the month. Maybe...