Hello and thank you for consulting JA,
I would highly recommend a strategy called Token Economy for all of your children. Let me explain briefly but then I will also refer you to a website . There are many different variations and it is best to change it here and there to keep the children's interest.
It has 2 phases: Phase one: children receive reward for good behavior;
Phase two: children receive reward for good behavior BUT pay a fine for breaking the rules;
So first you need to develop a rule list (similar to the list they have at school but adapt to home): for example: keep hands and feet to yourself; Accept no for an answer; You need to decide on the list, of course, but keep it very simple, concrete and clear. (Be good: is too vague). Money in a jar usually works best. Reward at end of day if all rules met. You want them to experience the feeling of success at first so make it realistic.
Once the idea is in place and up and running, introduce the concept of paying a fine. SO reward at bedtime if met all rules but pay a fine if any rule broken. Once again you want them to feel good about their jar of money so the fines do not need to be TOO large.
Here is a website:http://www.rewardingkids.com/tools-to-change-behavior/token-economy/
But you can find many more websites by using key words token economy.
I hope this helps and good luck.