Stop your child from hitting : Step 2
One trick that has always worked for me and my clients is to tell the kids what they CAN do, instead of telling them just what not to do, so there is no confusion.
Kids mostly love to please their elders, hence showing them how they can, would really help them.
In this scenario the main goal is to model gentle behaviour in front of them, something which they would copy or at least start to register consciously.