Nutcracker - 2.5 weeks ago my boys (7 and 9) were driving me crackers, particularly at the weekend they were being rude, cheeky, and unhelpful: and not doing their chores without a big fuss.
I spoke to them and said their attitude was unacceptable, and this is what was happening. I confiscated their Gameboys and banned them from the PC. Then I put up in the diningroom a chart with space each day for up to 16 ticks and up to 16 red (=bad) marks. It said at the bottom:
Ticks will be awarded for good behaviour
Fulfilling regular expectations without prompting: taking fish oils/vitamins, sorting clothes/laundry, putting coat/shoes away, brushing teeth, clearing the table, doing piano practice, doing jobs, etc.
Also for particularly charming and pleasant behaviour ? asking politely, waiting patiently, having an interesting conversation, etc.
Black marks will be given for bad behaviour
Any sort of rudeness, impoliteness, swearing, sillyness, inappropriate language, etc.
Screaming and tantrums instead of communicating with language
Any form of violence and aggression
Making a mess and not tidying it up.
Getting up before 7 am.
Being disruptive and disturbing us during the evenings, and/or going to sleep too late.
Your GAMEBOYS will be returned when you have demonstrated by this chart that your behaviour has returned to being acceptable, and you are a pleasure to live with.
In addition the PC is off limits until the playroom and bedroom are tidy.
After an initial blip Ds1 responded very well and got his Gameboy back after 4 days. The chart finished after 5 days, but we continued the ethos iyswim and ds2 got his G back after 8 days.
We didn't actually have a specific "reward" as such, but the reward - for them as well as us - is to be in a pleasant, calm house where everyone is nice to each other: and we have talked to them a lot about this.
Btw the playroom is still in turmoil so they've not been on the PC at all: I plan to tackle this with them at the weekend.
I think everyone goes through phases with their children (I know I do), no matter how 'nice' they are normally, where you suddenly have to clamp down hard, be really strict, and make a new start completely.
Sorry that was so long, I hope maybe something in there is helpful to you.