I don't have any children, but I know what worked for us back then...
And I saw this weekend it continues to work for my sister with her 3 children, well the 2 older ones, not the baby (he gets a uh-uh, na, no or ta-ta):
*ignore
*verbal warning
*separating the 2 of them from one another with (verbal warning, where you have to watch the words that come out of your mouth)LOL
*slap on the hand, buttocks, or a pinch
* the nearest object to the hand to throw "at" them...LOL
All of those are POSITIVE!

THEY WORK!