I dont have the answers, ive got that x3 lol

However we have introduced the "gentle hands house" and that we only use gentle hands with each other and if you don't then you have to go to your room until you are ready to be part of our gentle hands house.

Probably sounds kind of sucky, but it has been working.

I'm pretty tough if they start fighting over a toy though - if they can't share - they lose it and nobody gets to play with it.